It depends on what's her taste in films. I'm a girl and I'm very excited about the transformers movie, and plan to go see it sometime this week.
If this is the first time going to a movie together, I would say - choose something a little less masculine, but if you've known each other for a while - why not?
Also, this might work as a trade - she goes with you to see a movie she's not 100% excited about and in exchange, she get to pick the movie next time or the restaurant after the movie.
To me - Transformer's a real part of my childhood, and I can't wait to see the modern incarnation.