I think once the baby is born alive, then the mother has ZERO say in what happens to it. While it's inside her though... that's when she gets to call the shots because that's involving HER body in the process.
I don't understand why anyone would terminate a healthy pregnancy after the baby could survive on its own if she just birthed it. I don't see why you would terminate when you could just have it and let it be put up for adoption instead. BUT... I know there's heaps of reasons why people perhaps wouldn't like that idea, and so I acknowledge that it's not really my call when it comes to another woman and her foetus.