Laurie
What's her schedule like? Is she still taking a nap? If so, is it on a regular basis and for how long?When is wind down and when does she usually fall alseep? Other than the big girl bed any changes (new school, caregiver etc.)?
My dd is 2.5 as well. She normally naps for about 1.5-2 hours, from 1pm to 3 pm. I put her in her crib around 7:30 and usually falls asleep between 8 and 8:30 but sometimes it's 9 o'clock! I've read a lot of posts on this board about lo's this age not falling asleep until fairly late. It may be that while they still need their naps they do push back bedtime. Depending on when nap time is you may want to try moving it a bit earlier or restricting her nap to more than 1.5 hours. If you post her schedule that should help us to see if it's just her schedule that needs tweaking.