It's natural to want to protect her, but you can't babysit her 24/7 and continue with your studies and work.
I, too, suggest some Al-Anon meetings.
Have you suggested to your mom that she try to get some help for her drinking? You can tell her that you love her and want her to enjoy her life, but that you fear it is going to be cut short by her continuing to drink. You can tell her you're worried about her.
That's about all you can do. You could offer to go with her to an AA meeting if she decides she wants to go. Beyond that, it's really up to her to WANT to change.
Hugs, I think it's great that you are doing such healthy things for yourself. Add a little Al-Anon to the mix, and you will be unstoppable!