If she drinks, it's because she's an alcoholic. She is responsible for managing her problem, you are not. If she cannot cope with problems without alcohol, then anything which is too challenging for her to manage without alcohol will trigger that response. You did not create that way of responding to challenges for her, you can't cure it for her, and you have no control over it whatsoever. You do not have the power to make her drink or stop her from drinking.
Have you ever gone to an Al-Anon or CODA meeting? I ask because it helps with taking on ownership of other people's stuff, which I think from other posts might be something that causes unnecessary suffering for you. Al-Anon has a great book with readings for every day of the year, I found it really helpful even without meetings, and journaled out a lot of stuff. The meetings are good for getting support.
Sending warm compassion. I know things are hard, I hope you won't take on an extra burden that simply is not yours, even if she can't manage it herself -- no one else can, either.