Just Ranting About An Frienemie.

Okay; so I have this friend; well I have multiple ones; but I'm here to complain about a friend; who we are going to call Backstabber; her grandmother hates me and has threatened to call the cops on me before even though I did nothing to her; and I did call 911 on their granddaughter aka Backstabber; and that was because she was threating to kill herself; but we are getting off topic. Okay well Backstabber decided to steal by Boyfriend back in December than they broke up cause she found out he was cheating on her; with a couple of other women. And she decided to hack his FB account and he blammed me and her; than her grandmother blammed all the slhit on me and he called the cops on her and declared cyberbullying and crap; so she hasn't talked to me since than and her grandmother told me to stay away though I did nothing and it was her fault for even letting him say nasty things to her. And well; long story short; I also found out she had been lying to me and all kinds of crap so I hate her but I love her and I dunno what to do. I want to stay away from her but I also want to talk to her; and I haven't talked to her in over a month now I'm just worried because she has a history of drug abuse -- with phrisciption drugs and she has a history of cutting and suicidal attempts and stuff and she has a mental disability and I was her one resource to go complain to and make her feel better so I'm just worrying now; and I dunno if I should try to contact her or what.. What kind of mess have I gotten myself into!?