My hyperbolic pregnant ten year old example did include that the pregnancy would kill her.

How does morality and culpability thing work when an abortion is to save a a woman's life? How does Catholicism deal with cases where continuing the pregnancy probably will kill the woman but might not?

(I'm a partly interested because I went to a talk on Jewish medical ethics today and some of it was about the difference between certainty and likelihood and what behaviours depend on each.)