My wife has created a Draw Something account directly, not using Facebook as the login mechanism, but she now regrets doing that. Can she associate the existing account with Facebook somehow, or does she have to create a new account (and lose all her coins) if she wants to do so?
Well, for one just go to draw something, hit the settings button in the top right, and tap help. It will take you to a help section, and your question is the very top one listed... I'll re-type the reply here for you:
Word for word ;) Hope this helps!