Rant & need advice

My mom has struggled with alcohol and misusing pills on and off and won’t admit it. She just took two pills and is all loopy and acting weird, spurring words, and even forgot to lock the doors on her way inside from sitting outside. I love my mom but I can’t stand this. I know this is her way of escaping and she’s always telling me she’s trying to be a good mom , etc and she is bug she can’t be a good mom when she abuses alcohol and pills. I have hidden her alcohol and took her car keys, she says she’s going to bed and it’s only 9 pm. She never does that. I am so tired of feeling and seeing her when she’s like this. I don’t know what to do. I am writing her a note that I’ll give her tomorrow letting her know how this makes me and my brother feel. I can’t move out because I don’t have money or a good job. I wouldn’t be able to afford living elsewhere. Does anyone have any advice?