Love, if someone has their minds made up about having an abortion you cannot really 'talk them out of it.' in the situation that she was in, being pushed out of her family, you most likely couldnt' have talked her out if it. Sadly, she realized after it was done, her parents most likely woudn't have abandon her and she wished she could take it back. I know I did.
I beg you to try to talk to her and let you know that you are there because this is a very hard time for her to go thru alone. She is most likely going thru it alone and needs someone there by her side. You were an understanding friend, wether you agreed or not, so now go be by her and show her the support you showed hre in the beginning.