Anonymous wrote:Stay away until she's better. Hopefully your parents will understand. If they don't, they're a problem, too.
This. If she has anger issues and directs them at you, stay away so your presence can't provide fuel for her anger. I wouldn't make a big announcement of this; don't email or text or phone her to say dramatically, "I am staying away from you!" Just say "I can't make it, I have other plans" every time you are told about a gathering where she will be present. if she tends to act better in certain settings--for example, if she seems able to manage herself more acceptably if you're out in public at a restaurant etc.-- you might start seeing her just in situations like that, where you can walk out easily if she acts out.
Of course, this all works only if you and she are not living under the same roof. You don't say in the post -- does she live with her parents and you don't? I hope that's the case. If not, you and your parents may need to set some rules about how all of you will respond to her, such as walking away and minimizing contact in the house. But I really hope you don't live there.
I would not cut her off if she's getting psychological help. It can take a long time for results to show, unfortunately. Maybe you and ypur parents could consider family counseling with her--? It might help bring to light how her anger affects the rest of you.