Miami Ballet in Florida takes 10 year olds and it's excellent. The video audition deadline is March 15 and it runs the first week of August. It's by the beach and a fast train ride to Disney World so your daughter may enjoy the adventure. I haven't found many intensives in Europe that take young children. We also applied to Paris Opera Ballet as they take young ones but the deadline is passed. Haven't heard yet on results and there appears to be no forum here for it, so unsure how popular it is.