No, I'm illustrating the greater right by her moral capacity to abort to save her life. By logical necessity the fetus is the moral inferior of the pair.
You would be right, if the situation was the following:
The doctor can only save either the mother or the child. The mother has the moral right to choose to save her own life and sacrifice the child.
This is not the case.
Doing so
would not be morally permissible.
In the event that the mother's life is in danger during pregnancy (for any reason), the doctor's moral obligation is to
save every life he can.
Not to save the mother's life, at the cost of the child's.
Not to save the child's life, at the cost of the mother's.
They have an equal right to life.
Why? Because their right to life comes from an equal source - the fact that they are both
human.