She's not into violence, huh? There goes Predator then, too. I'm impressed you were able to get her to watch The Thing. We just re-watched it a few weeks ago and the practical creature/gore effects are so fucking amazing. Jessica was so in awe of it that it nearly drove her to cry tears of happiness.
Judging from the movies you said she liked, perhaps the John Hughes teen movies would be more up her alley. Or Labyrinth.
Fortunately, Jessica and I have nearly identical movie taste, so we don't have to worry about suffering through each other's movies. For the past five or six years we've actually been on a quest to watch all the most notable movies in chronological order. From the silent era on up. Now that we've finally made it to the early '80s, we've broaden our selection to include every genre movie that's notable or interests us. Yeah, we're a little insane, but it's good research and it's interesting to see the evolution of film.