Just a "Cafe Disaffecto" snapshot (not a very good one, but it's the best I can do) of Andrea sitting by herself and lowering what appears to be a brown beer bottle, which she hides a moment later because a spotlight has been turned on her. She was drinking from it before the light came on.A lot of fans recall this moment, though I don't believe it made much of a splash in fanfic. Andrea is often shown smoking cigarettes, but (IIRC) not drinking alcohol. Correct me if I am wrong.
So, Lindy in Is It College Yet? wasn't the only youthful drinker in the series.
"Whenever I drink alone, I prefer to be by myself. . . ."