knowthetriggers

I agree with Lexi - she is sliding and there is nothing you can do to stop her.

I would suggest to educate yourself as much as you can. Alanon can be a lifer saver for you and your mother. If your mother refuses then it can still help you not only with the problems you face with your sister but also your mother.

Keep sharing and keep coming back!

P.S. I would also suggest you read Codependent No More.