Allie, I am so sorry. While she is awake and cognizant, now would be the time to have her sign a Living Will so that decision will not fall on your shoulders. The hospital should have them available. You should be able to get one tomorrow from a hospital Registrar or Social Worker. You can fill it out for her and just have her sign it. It has to be witnessed by 2 people. This way, should the time come, it will be HER decision and not yours or her partner's.
Who is getting the booze for her? I can't believe that she is strong enough to go get it herself. If it's her partner doing it, let him know he is killing her. Sure, she will get angry and have a fit if he refuses to get it, but he needs to be strong and resist. Could she possibly be discharged to a nursing home or extended care center instead of to home? You might mention this to her doctor and let him know that she needs to be where she cannot obtain alcohol.
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"But that was yesterday, and I was a different person then."
Lewis Carroll, Alice in Wonderland