I think it really depends on the child hun. One of mine was much like that, the other sleeps for 10+ hours at night and up to 4 hours during the day - even at 3 1/2 ! Some kids just need more sleep than others. If your DD seems to be fine with that much sleep, then that's probably all she needs. However if she's grumpy a lot, and is crashing before the end of the day, then she probably needs more. I don't know if it's just my boys, but I find it really easy to tell when they need more sleep. They really are quite different when they are tired.