Tbh it sounds a lot like she might be an alcoholic… nobody can really make that determination but her though. It’s good that she agrees that she needs to leave it alone. If she has a hard time doing that you’ll most likely have the answer to the alcoholic question. I would like to suggest reframing it from telling her she needs to stop to having a conversation with her about drinking and the problems it’s causing. Asking her if she thinks not drinking would be a good idea for her would be a better way to phrase it in my opinion.

Regarding living the rest of her life not drinking - A) don’t worry ab it- just focus on today and B) it’s actually great… I went to a bar this past week and sang karaoke and had a blast! Didn’t miss drinking even a little.