Mona's death

Two points about Mona's death

1 "it is too late for a c section" It is never too late for a c section.

2 Later on in the film Tryon's character is told 'you atoned' already for Mona's death after it was said that Tryon's character made a mistake in treating his sister "like a priest and not a brother." (a) If is not a sin to save the infant at that expense of the mother there is nothing to atone for. (b) Why is it not a sin for a brother to ok the abortion to save the mother.