Hi, Bpdmom19$

Welcome to the site, I am glad you found us.
You have been through quite an ordeal and maybe still processing trauma, I am so sorry.
HopinAndPrayin has some good advice to consider.
I think you should consider a restraining order if you don't already have one and adhere to it. Many people who go to get them feel bad when they get to court and back down or ask the judge to be lenient. Just remember you are doing what you must for your protection, you were placed in this situation through no fault of your own and she will have to find a way to make do on her own. Perhaps the police are also pressing charges. It's good to have both in place.
I am sure you do feel defeated, but you are not a failure, you tried. We can't help people who do not want to be helped.
In that same line of thinking, if she going to kill herself, that is what she will do, and you would not be responsible for it. It is a choice she would make. Again, you tried to help her.
I think you can probably tell I am at zero tolerance for BPD and the like, and not everyone is in the same place I am in, and that's ok.
I do think you have to think of your safety and well being first, whether you try to help her again or not, it's that old saying about putting the oxygen mask on yourself first or however it goes. But, you are not under any obligation to help her. She brutally abused you and it's ok if you just say you have had enough and you want to live your life free of this.
If anyone is responsible for whatever happens with her college, it's her, not you. She made these choices.
It's really ok to let go, and it's ok to feel guilty about it, it doesn't mean you did the wrong thing, it means you are in an impossible situation and trying to do your best.