E.I.
well...
first of all you have to figure out if there is a need involved.
is she scared of anything? are there wierd noises at night? is something poking her? are there spiders or something in her room that could have bit her once? any windows without curtains or shades? branches tapping on windows or roofs? mice in the house? scratchy pajama tags or something? too cold? too hot? nightmares?
if any of those of course you have to be sensitive to her feelings and dont make her uncomfortable. she doesnt have to sleep in your bed if you dont want her to, but she can perhaps have a special place on the floor in your room. a matress, or a couple blankets laid on the floor. :D
night is a tough time for most kids. its hard when they cant quite see whats around them. im still nervous when im someplace that i cant see totally... dark or deep water you know?
maybe try running a fan or something? i dont know. something is going on, and its better to nurture her and help her to get through this than to just think shes being a stink. i cant see a kid purposly waking up at night just to 'get their way' or osmething you know? why would a kid who doesnt have any issues sleeping wake themselves up for a selfish reason? i just dont see hwo its possible.
so deal with it in a sensitive way.. see if it goes away on its own. she wont want to sleep in your room when shes 12 or anything, so its not like you are teaching her a 'bad habit' per say. and then, you might MISS her nightly visits! :D
anyway good luck.
see if www.askdrsears.com has any information for you.