Wow. You all are too nice... Hvert, this is probably going to sound awful, but I'd bail. She doesn't sound like a close friend, and she doesn't sound like someone that is a good potential friend. I'd stop taking her calls, and just disappear.... assuming that's possible (you don't run into her in other social situations?)

I don't do Facebook, so I'm not sure of how it works. Can you disconnect yourself from her?

And, yikes. That sounds awful...