My oldest brother is a former alcoholic and I see what multipixie says about one's partner. My sister-in-law doesn't drink so they're a "pair" and that goes a long way when they're around "normal" social situations where others are drinking.

I think you should do for yourself what you are comfortable with doing and want to do for you. If you happened to give up drinking when the two of you were together with others, that might be supportive for her. But if she says she's all right, then you have to take her word for it that she's all right. Second guessing others is not a good tactic for us or them.