(((shrinking violet)))) wonderful to hear that you feel so strongly about protectiing your daughter. I think it is a good indication of how much healthier you are than your mom.
I don't think that her going back to the same harmful people and behavior has anything to do with YOU. It's not that she disregards you or is demonstrating how litle worth you have. I don't think in her world of addiction she can see further than her own nose. Alcoholism plays som of the same games as depression, but addictions usully cause the addicted to project their feelings for them selves on others or disregard those who don't affirm the addiction.
She thinks she should or can control her addiction, but because she can't admit there is a problem in the first place, she tries to hand you the responsibility instead. You point out the mess her addiction has gotten her into, so she disregards whatyou say, because, in the end, the alcohol is her real love.
I appreciate the fact that you are stuck with her right now. Things aren't always ideal or even close to it. I know you are already planning to get out as soon as you can. I want you to know that I am thinking of you, supporting you in your efforts to maintain your own health in the face of this. Rohag has a very good post, and his questions are worth thinking of. I feel for you, but I also admire you. Even though you live with a person who is sick and dificult, you are taking steps to try to protect yourself and break with her example. You are a strong and wise person, violet. Never forget that