I'm struggling to recall a scene in The Big Bang Theory where Penny isn't drinking, getting ready to drink or making a crack about needing a drink (usually in order to make some interminable event go faster)

Is there any evidence within the show, or from outside via the show's creators/writers, to confirm or deny that Penny has an actual drinking problem?

http://i.stack.imgur.com/GQNUE.jpg

She sure does love her wine. I wouldn't consider her that though.

Ah, Peppermint Penny.