She's at a loss and feeling the pain of being shunned...
My only advice is this..."Friends are the family you make for yourself." - Anonymous
I know that sounds really general and it glosses over a lot of the nuances of being shunned...but this isn't her problem. It's her family's problem. Does it hurt? God yes, it hurts...but it's all about building a support system that doesn't rely upon conditions for it to function. I now have friends and 'family' in my life that love me unconditionally, and that won't change (well not unless I destroy one of their garden gnomes or something...)
I've been on the receiving end of the shunning stick...and once I started reaching out to others and building a network for myself that was free from conditionality, that was when the pain lessened a little...do I miss them? Yeah...but would I be willing to sacrifice my own personal beliefs and code to regain their 'conditional' love? No way!
Not sure if that helps at all or if I just typed a pile of nonsense. I do that from time to time. Best of luck to ya...just be there for her. That's all any of us can do with one another.