[DoubleF]

Figure out a way to maintain communication even if it means being kind of a pretender?

Never been in your situation before, but merely theorizing on top of some of the advice already posted here. I maintain friendships with a few friends that are alienated by friends. On occasion, I've found that such a bridge can help towards reconciling said friends back into a group. Maintaining communication is important. I don't know how it might be achieved, but don't let contact slip away.

Sometimes, someone has to be the one who maintains communication. This could involve perhaps "brown nosing" and "being on her side" sort of thing while other friends keep up the "all against them charade". If everyone just backs off, she might feel alienated and not feel like approaching the group if she wants out (so to speak). But if everyone keeps their opinions, then she might be the one to back off. It's a fine line. But if everyone is all of a sudden cooperative to the "plight", it's weird and she/he may know something is up and recede.

Obviously professional help is far superior to everything else mentioned here, but maintaining that line of communication and maintaining a seemingly normal interaction is probably important too.