The mother has free will until her child has free will. It's not her child until it is in her hands. Til then it belongs to G.o.D. or GH as I like to say, or jodie. You can't kill anything that is your ignorance if you think you can. The mother decides--period. You can argue all you want but you are missing the Golden Rule and that is a sin, which means you missed the mark that time.

There are a lot of ways to look at this. Your post reminded me of this familiar work below, which I have not read in a long time:

On Children
(Kahlil Gibran)

Your children are not your children.
They are the sons and daughters of Life's longing for itself.
They come through you but not from you,
And though they are with you yet they belong not to you.

You may give them your love but not your thoughts,
For they have their own thoughts.
You may house their bodies but not their souls,
For their souls dwell in the house of tomorrow,
which you cannot visit, not even in your dreams.
You may strive to be like them,
but seek not to make them like you.
For life goes not backward nor tarries with yesterday.

You are the bows from which your children
as living arrows are sent forth.
The archer sees the mark upon the path of the infinite,
and He bends you with His might
that His arrows may go swift and far.
Let your bending in the archer's hand be for gladness;
For even as He loves the arrow that flies,
so He loves also the bow that is stable.