Hi and welcome ConcernedBF
As you know, it's very difficult to assess a problem in person...it's that much harder again on the Internet.
I've known people who drink heavily but can take it or leave it...they have none of the mental obsession...on the other hand I've known people who drink comparatively little, or comparatively infrequently, but who identify as alcoholic.
I never left anything in the glass, but that just says something about me
I think you are concerned, and that's valid.
Maybe if you commit to giving up the chocolate and alcohol, she can be talked into making a similar commitment?
If she won't, can't, or doesn't last very long, then perhaps that's more grounds to consider your concerns are well founded?
D