See
my thread a couple threads down. Sounds like you are where I was about 3 years ago. Aware of the drinking, unhappy about it, unable to stop it.
I don't know if I have any real advice for you. From my mother's experience, it's depression and anxiety that fueled her need to drink. Alcoholism doesn't happen in a vacuum. It's usually tied to something. Some need to forget or to escape from some kind of personal pain or anxiety or angst.
You could try asking your mother why she drinks, and not accepting "because drinking is fun, duh" as a response. You've already tried communicating with her about how it makes you feel, right? If that didn't sway her, chances are nothing else will.
I hate to not give you any hope but....my mother had to become a full-blown alcoholic and had to hit rock bottom before she legitimately sought help. The best you can do is show her how drinking is affecting her life and your's, and hope that's enough to convince her to, if not quit or seek treatment, at least slow down.
Point is though, to focus on yourself. Your mother may in fact wreck her life with her drinking. The _only_ thing you have control over is how you're going to let her drinking affect your life. If hiding to insulate yourself from the negative effects of her drinking is all you have, that's what you gotta do. If her drinking is putting you at risk for doing something you shouldn't be doing (smoking pot. I make no judgments on the rightness or wrongness of smoking pot, it just seems like it's something you know you shouldn't be doing right now) then you really do need to separate yourself from her and her environment as best as possible.
It's something I've had to learn over the last month and a half: there's nothing you can truly do to get an alcoholic to stop drinking. It's all on them. The best you can do is tell them how you feel, be supportive if they do try to stop and to make sure it doesn't ruin YOUR life and emotions in the process.
But yeah. I'm getting the vibe you're as frustrated with your own situation as you are with her drinking. As a pot head I can sympathize. Having to be clean when people around you are not is hard. Just make sure you're not conflating the two (concern for her drinking vs. being pissed you can't get high. One is legit. The other is pretty selfish.)