this premise is more similar to a fetus being able to force the mother to bodily support it without the mother's consent than it is to a woman choosing to remove herself from bodily supporting the child, thus leaving the child to it's own bodily devices.

That's not physically possible.

Is sarcasm acceptable?

The original idea didn't specify that it had to be by pure willpower.

Labor can be inducted with medicine similarly as heart beat can be stopped with medicine.

This implies the person believes life begins at conception or later on in the pregnancy/birth.

Fetuses aren't asked consent to be born in the first place.