I can also relate to your GF's suspicion of role-playing. Being an (almost) gaming widow myself, and a sort of mundane (although I was a bit of a Trekker even before Brian), I know what it's like.

My advice to her is; if you can't beat 'em, join 'em. Try getting her involved in some "gateway" board games like Carcasonne and Settlers. Everybody loves those. I even tried to play a character in Warhammer, but soon got bored. Soon to start up with a Star Trek RPG though, which I'm looking forward to.

Too bad we don't live nearby. I'd love to play a Jane Austen RPG.