I so totally agree with everything MickeyCheeky wrote, in her usual lovely way. I think you do need to look out for yourself right now. Stepping away (via blocking out an abusive or triggering person) is sometimes what we have to do. I'm sort of doing the same right now with my father.

I remember going to Al-Anon a while back and hearing them say how important it is to take care of oneself first. Initially I was angry, thinking "I'm here because I want to learn how to "fix/help" my father!" The fact is, however, that that is/was not possible. He must help himself. It sounds like you have helped your daughter as much as you could. She's no longer a child. Sometimes cutting the cord from someone who needs to help themself is more of a gift than enabling and tolerating, which can only prolong their avoidance in making changes. Just as alcoholics sometimes need to reach a bottom in order to accept help, work hard on their issues, or generally learn life's lessons, so do people with mental illness, or other similar issues.

I definitely know how this can make you feel sad, but I also encourage you to look at it in a brighter way. You are giving her tough love. It's hard to do, but it may be the greatest gift to her. If she doesn't eventually realize that, it's a pity, but you cannot do the work for her.