I don't know if you even have to bring it down to religious faith.My understanding is that there are at least some atheists and agnostics who are pro life and,thus,could probably appreciate the "spiritual" or ethical significance of this mother's act.
(For the record,I am neither an atheist nor an agnostic)
That said do not mistake this righteousness with justification efficient for salvation. He used this fact to strenghten the argument for those who did know the"Law" that they were more strongly condemning themselves to Gods wrath by their rebellion.
This is why Christians can be so unbending on abortion ,We are slaves to the sinful nature revealed by the Law but we are more so slaves to God in our Spirit.Dead to Sin alive in the Holy Spirit through Jesus Christ.
In time of weakness we of course still sin.
Sanctification is a life long struggle. But the Holy Spirit was too strong in this woman to rebel against and she could not deny God glory in the creation of this life.
Okay, too long here, point is your right.
Come to think of it I was Pro-life before I became a Christian.
Being pro-life is logical if you believe in the efficacy of evolution.