Hmmm~ Do you have a 'set schedule' for her at all?
For my son, once he started to develop a bit of a sleep cycle, I put him into a routine. Trust me - a routine is key for kids and you. I have had some in my life chide me for it, but it saves sanity for you, your child and those around you in the end.
Example of my son's schedule from before:
He would be up at 7am, be fed and play. Nap by 9/10am
Up from the nap by 11/12 depending on when he went down and have lunch and then play for bit more - and then one more nap at 1/2pm. Around 3/4pm he was up and I usually kept him up and entertained (w/ a snack) before and after dinnertime. His bedtime was 8 or 9pm at that time as his naps would go for about two hours.
A bit later, he took just one Long 'power nap' and this worked for us too.
After some time, we found that he was not going to bed on time for us. The reason was, he was ready to give up naps, but he still had the 'quiet time' in his room or with me on the bed or couch with a book. When we did this, he was in bed on time and out like a light~ ;)
Right now, at age five, he is up in the morning for school by 7am and does not take a nap - ever. He goes to bed by 8/8:30pm. We get him ready for bed by 7:40pm with the bedtime routine~ During the holidays, he may be rewarded for good behavior to stay up for an extra half hour to watch a special on T.V. (Like Charlie Brown or something).
Never had a problem like this, tho with him staying up so late. His only issue is he likes to come into our room to snuggle when he kicks the covers off as he gets chilled. He's my only one, so I don't think the hubby minds this either. :)
If you do not have a bedtime routine set, try implementing one as well - give her a choice of story as this helps them get sleepy. Just make sure it is a suitable bedtime book. If you are getting close to the time you want her to sleep, make sure it's a quick book like 'Good Night Moon'.
If you allow her to stay up for a special as I do for my son, then make sure she understands (or give the choice as I do) that the special on T.V. is her 'bedtime' story. So once it's over - it's into bed after hugs & kisses. This works out very well with my son.
(When he is acting up, I just have to mention if he keeps it up, he may loose his story - trust me... He LOVES his bedtime story and reading to your children is a great way to help them read, too.)