I think quantifying what you THINK she is drinking - well you don't know how much she drinks. This just sounds to me like an obnoxious drunk who is trying to appear not as drunk as they really are by engaging in conversation with you.
My guess, she doesn't remember most of what is going on. Your discussions with her about her behavior a waste of time.
Glad to see you are tired of it. Living with an alcoholic is just no way to live.