Hey Keith,
Emotional distance can be a sign of a drinking problem, but it could just as easily be a personality matter.
Alcoholism cannot be measured by the amount of alcohol consumed, but the effect that any alcohol has. Two martinis a day plus drinks in the evening might be cruising above the Surgeon General's recommendations, but that is not exceptionally problematic in itself. And two martinis is not 8-12 drinks, 2-4 depending on how they're made.
My advice would just be to stick to the facts that you do have on hand:
1. The emotional support you want, you're not getting.
2. She has a few drinks everyday and you're concerned.
There's not going to be any peace for you unless you speak to her about it. Trying to put together disparate clues and making guesses is not the way to peace of mind.