[Caz]

Does she still have a sleep during the day Jason?

If so, the only thing I can suggest is cutting that out if possible. Try doing it gradually by letting her have shorter & shorter naps. Plus try & keep her as  active as possible during the day.

Started taking my youngest two (13 year old twins) for long walks during the day & basically keeping them as busy as possible.
They gradually slept longer at nights, though they still made a good stereo alarm clock! ;D

May just be though that your little girl is one of those who just don't need much sleep, like a lot of tots. My first was like that but eventually started nursery and adapted to a more normal sleep pattern.
(He's now 31 and can sleep for England, with or without alchohol! ;D ;D)