Lila - Did you take her to the potty when she woke up? Or did you get the flashlight and look for pinworms?
I also recommend getting a new-age type sleep cd, one that is specially designed to entrain brainwaves. Play it every night as part of your routine when she goes to bed. Then play it when she wakes up in the middle of the night. Eventually it will cue her to go back to sleep.
