Rarely is a woman "forced" to have an abortion; that's usually after-the-fact rationalization from women who subsequently developed guilty consciences about it.
Pressure? Yes, I'm sure that happens all the time. But forced? I'm sure that happens from time to time, but it's much more rare.
In any case, you would treat this like any murder case. If these other people (e.g. men) materially participated, then they should be tried as accomplices. If they tried to persuade her to do it, they could be accessories or conspirators in murder. If a woman were forced to such a degree that it was no longer a free act, then of course she could be found not guilty. But, despite the outward fear and pressure, sin is still sin if there's any element of free will left. So, for instance, those who apostasize under threat of death or torture, still commit a sin; it's merely that the gravity of the sin in God's eyes may be extenuated due to these external pressures.
I agree with you to a point.
However, there have been studies done showing that women and girls are often forced or convinced to have an abortion by their mothers, dads, schoolmates, boyfriends, lovers, doctors, nurses, teachers, etc.
All those who convince/force a scared new mother into having an abortion are accomplices. If these accomplices do not confess their sins, they will suffer hell fire.
When I was in college, a scared young Catholic college coed came to me because she knew I was strong in the faith. She told me that all her friends were trying to force her to have an abortion, but she knew that she would be strengthened by me into choosing life.
Unfortunately, when she was nine months pregnant, a doctor prescribed a known abortifacent antibiotic for an infection, when other less dangerous antibiotics were available. Unknowingly, she took the medicine. She lost the baby within five days. Doctors wanted her to go to an abortuary, but she refused as she wanted nature to take its course. In addition, she had heard that several doctors had falsely said that babies were dead in utero, when they were still alive.
Throughout her pregnancy, she came to me for advice as I was the only one she could trust. Upon my recommendation, she gave the child a Christian burial after baptizing him conditionally immediately following his stillborn birth. My husband and I were there for his funeral and burial. In the small coffin, the child looked normal in every way. He looked like he had just fallen asleep.