My only two questions are what time does she wake up? And is she getting enough mental and physical exercise during the day?
My DS goes to sleep at around 7.30 but he wakes at 5.50ish every day. He has just dropped about 30 mins from his old sleep habits (used to sleep at 7pm).
He is also a bit of a handful if he's had a day of little exercise (both brain and body).