I am so sorry. It is tragic to watch. Please know, no matter how much she tries to blame you, or anyone, that is not true. She is a severe alcoholic and is just looking for anything to condone her drinking. Unfortunately it will be wash, rinse, repeat.
It is tragic to see that some people don't have a bottom at all. Just remember the three C's. You did not cause it, you cannot control it, you cannot cure it. You sound like a wonderful person, you have done all you can.
Tight hugs.