I do understand why people would suggest an abortion. It makes sense logically but not morally. She can get an abortion, put the child, the fling and possibly impacting her sister's marriage behind her and move on to have her husband's baby. However, morally speaking...its wrong. Its a baby...a child and he/she has no fault in this entire scenario and should not be paying for her/his mother's sins.
Her sister's marriage will suffer and most probably will pay for her sister's mistakes. That is a fact that will have to be accepted. Its simply too late in the game to do much damage control. All she can do is tell her husband and pray for the best...that he will accept her with this mucked up situation.
Another thing: if she isnt too concerned about repenting...why are we even discussing this? Stay out of this, let her deal with it, she will reap what she sows. Its one thing if the girl realizes her mistake, is sorry, wants to correct herself and is trying to find a solution to her problems BUT if she doesnt care...why do you?
Do not gossip about this, meaning dont tell a soul and contribute to the destruction of her marriage (not saying you are). But if this woman isnt concerned abut her future, husband, baby, fling, etc. then allow her to take care of it.
Grab a box of popcorn and relax.
Mahiya ... some of us do feel that since you know of this sin .. you should keep on trying to let that girl know what is the right thing to do ...
but i so very agree with Bon .... if that girl isnt repenting .. she will learn the hard way .. we can only feel sorry for her husband and child and inlaws and even parents ....