MrD...you didn't mention her best movie, the Terry Gilliam directed TIDELAND! Not a horror film, but beautiful, disturbing, and weird as hell (with it's share of creepy elements). She plays a lonely girl living in an old country house, with only a CRAZY family living nearby and the rotting corpse of her father to keep her company...nice!
I wasn't too impressed with her acting skills in Silent Hill, but seeing Tideland gave me a new appreciation for her as a young actress.