What would I do? If i were in direct contact with Betty, be frank and honest - probably by email if I could. But that's not really an option for you unless you unblock, then PM on FB. It just wouldn't sit well with me at all to go sneaking around about this, and frankly, she's given you no reason to be delicate or sensitive. It's just not ok to say the things she has. She should know that people choose to avoid her because she behaves like that. Given she's not talking to you directly though, I think it wouldn't make sense to approach her.

I'd also be pretty direct with your friends. I understand why the don't like her and I get that turning someone away is awkward. But the way they're managing this is childish.

And yes, I've had to do it before. A friend who then became a parent and the way she was parenting (doing things that i believed were damaging to her son) and allowing he son to behave toward my child... the level of denial she was in about several aspects of her life and he tendency to shut me down and go on the defensive when I tried to process stuff with her... I realised that I had completely lost respect for her. It felt so wrong to accept or put off her invitations to hang out, when I found myself cringing and judging her. So I broke off the friendship and I was as straightforward as possible. I did it by email. I was both too scared, and felt I would be pretty confrontational for her to do it in person. She didn't respond... until 12 months later when she sent me a lengthy email telling me that she was grateful that I'd been honest, that she'd hated me for a while but then re-read my original email, taken the feedback on board and made some changes. It was too late for our friendship, but I think in the long run it was the best thing for all of us

Good luck Hun. If all else fails, maybe consider the bus?!!!