J.
My mother has a drinking problem, too. For many years it ate away at me. Finally, I decided she is an adult and needs to make her own decisions. I went over to her house and talked with her and my dad. I said my peace - told her I love her but I thought she had a drinking problem and I was concerned. I told her I wanted her to be around. I also gave her information on a few treatment options. Then I let it go. it is her decision. Unless my dad and sisters are willing to get on board to "force" her to face her problem (which they are not) there is nothing I can do.
Good luck. It is a difficult situation.