There are no arguments for abortion, under any circuмstances.

Definitely, adoption is the best option. There are Trad couples who would love to have children but are unable to do so. Someone like that would be the best option. Definitely not abortion.

Some real cases:

LifeSiteNews
HLI
Catholic Lane

Hard cases make bad law.

Once we understand that life is a gift from God and that these issues are not in our hands, then we can start to see that hard cases like this are really just testing our resolve.

NO! to abortion.

This rape discussion is a cop out has been done to death and is simply a way for the pro-baby killers to advance their evil agenda through emotionally charged arguments.

The fact is that rape counts such a small percentage of abortions that it is almost not worth mentioning. The chances of a woman conceiving from rape are very slim because she is so traumatised.  

disclaimer,     this is not a real story just hypothetical.

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Say a young 20 year old woman is walking on a street. Then a man with a gun comes to her and drags her into an alley and beats her up and then rapes her.   By the time she comes to her senses and seeks treatment they find that she had conceived due to the rape. Her doctor and friends tell her to abort the baby. The girl does not want to deal with the baby who is the product of a rape since it would remind her all the days of her life of that painful incident. so she is very sympathetic to the abortion idea due to the above circuмstances.

  Also she hoped to marry someday and wanted to preserve her virginity. Were she to marry should she then wear white?

        Also what are the arguments for or against the abortion decision under those circuмstances?

If a father of 8 children, raped one of his daughters, should her siblings since be killed because they would remind her of her father for the rest of her life?

Its an illogically weak position to take, and one which is done so for the sake of debate, more than anything. If someone asks this when debating abortion, as an attempt to play on emotions of all involved, turn the debate to the real reason the majority of mass unborn murder occurs

http://www.guttmacher.org/pubs/journals/3711005.pdf
TABLE 2. Percentage of women reporting that specified reasons contributed to theirdecision to have an abortion, 2004
Having a baby would dramatically change my life 74
Would interfere with education 38
Would interfere with job/employment/career 38
Have other children or dependents 32
Can’t afford a baby now 73
Unmarried 42
Student or planning to study 34
Can’t afford a baby and child care 28
Can’t afford the basic needs of life 23
Unemployed 22
Can’t leave job to take care of a baby 21
Would have to find a new place to live 19
Not enough support from husband or partner 14
Husband or partner is unemployed 12
Currently or temporarily on welfare or public assistance 8
Don’t want to be a single mother or having relationship problems 48
Not sure about relationship
Partner and I can’t or don’t want to get married 12
Not in a relationship right now 11
Relationship or marriage may break up soon 11
Husband or partner is abusive to me or my children 2
Have completed my childbearing 38
Not ready for a(nother) child† 32
Don’t want people to know I had sex or got pregnant 25
Don’t feel mature enough to raise a(nother) child 22
Husband or partner wants me to have an abortion 14
Possible problems affecting the health of the fetus 13
Physical problem with my health 12
Parents want me to have an abortion 6
Was a victim of rape 1
Became pregnant as a result of incest <0.5

disclaimer,     this is not a real story just hypothetical.

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Say a young 20 year old woman is walking on a street. Then a man with a gun comes to her and drags her into an alley and beats her up and then rapes her.   By the time she comes to her senses and seeks treatment they find that she had conceived due to the rape. Her doctor and friends tell her to abort the baby. The girl does not want to deal with the baby who is the product of a rape since it would remind her all the days of her life of that painful incident. so she is very sympathetic to the abortion idea due to the above circuмstances.

  Also she hoped to marry someday and wanted to preserve her virginity. Were she to marry should she then wear white?

        Also what are the arguments for or against the abortion decision under those circuмstances?

This is an interesting scenario, completely filled with emotion.  It is a scenario filled with fear, shame, loss, guilt, and hate.  In other words, this woman is considering abortion because she does not know how to deal with her emotions.  Of course, this is expected, well, because women are often guided by their emotions.

However, the facts of the situation deserve to be known.  According to some research done in 1996, 5% of women who are raped become pregnant.  But, the devil is in the details.  Almost all of these circuмstances involve adolescents who are raped by a known, often related perpetrator.  Almost half of these young girls, never receive pregnancy related medical attention. Regarding the abortion statistics, a full 50% procure an abortion.  

So in reality, most all of these pregnancy related cases, and that number is small, are due to either incest or a boy-friend of some sort.

However, I don't think this is the scenario you put out for us.  You use the emotionally charged scenario of violent stranger rape, which is really only a small portion of rape incidents.  But we will go with your scenario.  

A lot of research and self-reported surveys suggests that women who do become pregnant during a rape are often pressured or coerced by a loved one into having an abortion.  They are told that having the child will cause them to relive the traumatic event over and over.  However, of the women who actually do give birth to their children,  not a single one has regretted it and most of them said their child gave meaning to their lives and helped them heal.  

Again, your question about this young woman hoping to marry and wear white is also an emotionally charged question, and not one born out of logic.  A woman who is raped is taken against her will.  It is quite difficult to cope with.  But when a young woman is a virgin and hoping to remain so until she marries, it is especially gut-wrenching.  How will she explain this to her fiance?  If she keeps it a secret, will he know on their wedding night that she is not a virgin?  Will he still love her or will he reject her because she is not pure?  

These are emotional questions, wrought out of shame and guilt.  A good man, a good father, a good fiance, will seek to assuage his daughter/fiances feelings and love her more not make her fell worse!  Part of that would be to remind her that she indeed can wear white on her wedding day.

Women WILL NOT have abortions if they have someone to support them.  Period.  It is true almost 100% of the time.  Women have abortions because the people they love the most tell them that murdering their unborn child will make life easier for them.  They think that no one will know their shame or their guilt.  They think it will go away.  So their family members say stupid things like, "I will support whatever decision you make."  Or, "It's best this way."  Or, "What kind of life do you think this child will have?"

These are all lies of the evil one.  There is not ever a single circuмstance where murdering one's own child is a real solution to a problem.  Ever.  

A woman in the circuмstance you presented needs loving people to tell her the truth and support her during her pregnancy and after the baby is born.  Some women might believe it necessary to offer their child for adoption.  This takes courage and encouragement.  Other women might find adoption more difficult than raising a child.  In this case, the woman might benefit from family support, or maybe even marriage earlier than planned so the child grows up in an intact family.