I would suggest that she reconsider her choice of a husband. No time to write more, right now.

That was me.  Didn't see the box.

I doubt he will be amenable, because he's clearly unhinged, but birth centers are pretty great.  And failing that, there are many places where a midwife can be found who will assist at a home birth.

Otherwise, she needs to find a new fiance.

It is not at all clear to me that he is unhinged.  He seems to have legitimate concerns. I do not think we have anywhere near enough information to conclude that the woman is better off without him. 

How about a compromise?  Have a midwife deliver the baby at a hospital.  That way you're there in case something goes wrong and medical intervention is needed.  At least in my part of the country, lots of midwives have relationships with hospitals where they help deliver the baby AT the hospital.

I personally think that having a home birth is sinfully imprudent.  You're potentially putting at risk both the life of the child and the life of the mother.  Yes, there might be sentimental reasons for wanting home birth, but these are clearly outweighed by the risks and dangers.  If I insisted on a home birth and my wife and/or child died in the process where they could have been saved at a hospital, I could never live with myself.  Consequently, with that prospect, I would consider it a grave sin to do a home birth.  Yeah, yeah, Traditionalists tend to look at anything old and archaic and more "natural" as inherently better ... but that's emotion speaking and not reason.

In my experience, it was very difficult to find a doctor who did not perform abortions.

I've found many who have not.  Nevertheless, it's scrupulosity to say that you can't be assisted by a doctor who's performed an abortion.  You are in no way a formal, nor even a material, participant in those abortions.  If they're ONGOING, then you might be a remote material participant in the sense that you're helping him make money in general through the medical practice.  But even that would not be forbidden by moral law.  So let's not get scrupulous about having to avoid such a doctor.  Too much emotinalism on this thread.  Emotionalism about doctors who have performed abortions (certainly repugnant, but not morally wrong to be attended by one) and emotionalism about home births (ignoring the grave imprudence of having one in the interests of feel-goodism).

To the OP: Yes, of course she has a choice, but there is not a lot that you can do about it though.  You would be putting a wedge between the fiancée and bride to be.  You can offer to be supportive, and be an ear if she needs one. You can offer advice, but ultimately you are not in control of their family.  If they are both young, then he is probably listening to the influence of his parents, and she is marrying into that family.

I really do appreciate your concerns.  I prefer to eat healthy, live healthy and use natural remedies.  That being said, if I get hit by a bus, don't give me eucalyptus oil, take me to a hospital. Kid has strep, give an antibiotic.  I disapprove of the notion that you aren't Trad enough if you don't reject modern medicine. Not all doctors are evil, not all modern medicine is bad.  Hospitals have their place. There have been many comments I have heard in the past by Trad parishioners medical related issues that it makes me feel bad for their children.  I remember one mother that had a young daughter with untreated epilepsy because they didn't want to give their daughter drugs. "Drugs are designed to kill people." I remember a parishioner tell that same mother that the next time +Williamson was coming to request an exorcism.  +Williamson had apparently cured it once before through an exorcism at a baptism.  Or there was a family that had two cases of mumps.  They brought their child with mumps to Mass (on two different occasions) because they didn't believe in vaccinations.  In fairness I'm sure they didn't know it was mumps before they came to Mass with a sick child, but the principle remains.

All that being said, there are a lot of great things that midwives are able to do, and I will always speak highly of them.  You friend will be ok, and if not the midwife will make a recommendation.  Midwife services are far cheaper than a hospital.  The lovely lady we used identified a health concern with our third and wife had a emergency C-section.  Everyone is fine, healthy and happy now.  Either way praying for a healthy child.

With one of my pregnancies, I found out that my doctor performed abortions when I had already been seeing her for a few months.  I immediately stopped seeing her and found another doctor.  I did not see it as a moral issue so much as I could not bear to have her touch me.

It is all very well to say not to base decisions on emotion, but pregnant women are emotional.  My husband always indulged me as much as he could when I was pregnant so he was not going to make me see a doctor that I found that upsetting.