I had some problems with my first child and with the second one got a wonderful book from a friend "Called Healthy Sleep Habits, Happy Child" by Marc Weisenbluth, MD. He has a lot of wonderful advice. Sometimes you have to alter it to suit your needs, but you might find some great advice in there.
My second child is a wonderful sleeper even when he transfered to a "big boy" bed!
They have a bell curve of where most children should fall for total sleep and times. There is an old wives tale of putting them to bed later will make them sleep in. This is a tall tale! Actually if you put them to bed earlier they will tend to sleep later. I didn't believe it until I tried it - it does work! You might want to try putting her to bed between 7:30 and 8:00 several nights in a row and see what happens. Also I would get the book and check out what he has to say. There are also some special situations, such as, illness, allergies, large adnoids or tonsils, etc.
I hope this helps and you can get some sleep.
J. R.