L.W.
J.,
I agree with the other responses that it may simply be that your child doesn't need nearly 12 hours of sleep at night. Also, you should consider moving her out of the crib. She is old enough, and this may just be her way of letting you know that she is "a big girl" now. Another tool my sister used with her early riser son was a night light on a timer. He couldn't get out of his room until the night light turned off (7 AM). Hope this helps! Good luck, and congrats on the potty training!
Lisa, mom of 4 boys