Most WASs (or so it appears) are going through a period where they are completely self-absorbed, selfish, and narcissistic. Everything is about them...what they want, what they need, what they're not getting, what you're not doing...yada yada yada. I'd bet what you're seeing is the anger that comes from realizing that your world no longer hinges on hers.
She will have to work through this. The result may be that she rages for the rest of her life (or for many, many years) blaming others because she hasn't the strength of character to accept responsibility herself or she may get it out of her system and develop a more rational and mature perspective. For your sake I hope it's the latter. But right now there's no way to know.
Just don't let it get you down and don't let her draw you in. If you want to coach, contact them directly and just express your interest (or disinterest, if that's the case). But don't respond to her. She wants to drag you into an altercation so she can create new reasons to blame you for everything that is wrong rather than look at herself in the mirror. Don't give her the chance.
