"Abortion is not a mortal sin when the circumstances and intentions of the mother free her from culpability ... "

Just what "circumstances and intentions" would they be? 

The clear and uncompromising teaching of the Catholic Church is that the taking of innocent life in the womb is always gravely sinful. God would never lead a person to this decision. And it isn't a private matter. Murdering innocent children, with the State's permission and funding, demeans us all and speaks volumes about our culture.