My sister is anti-abortion, thoughts on this argument?

I had a debate with my sister in regards to abortion and she said that even if someone rapes her own daughter (in the future, she has no kids yet) at 12-13 years of age she will allow her daughter to give birth even if the daughter doesn’t want it because the baby didn’t do anything. At that point I didn’t know what to say as that seems just crazy to me. I think this is wrong but I would like to know your thoughts?

edit: (she has no kids yet)