I am so sorry Sam!
Unfortunately, alcoholics many times do drink themselves to death.
My husband did but I was there to do CPR and saved his life; but the experience did not stop his addiction. That was two years ago and he is just now trying to get and stay sober; but for many they never give themselves the chance to live without feeding their addiction. ☹️
It is gut wrenching for loved ones to watch the process however there is nothing to be done if the addict won’t get help.
Again I am so sorry! Tell her that you love her often and that’s about all you can do.
Sending you hugs and wishing you peace.