Hi Dale,
What is her bedtime/windown routine look like? What are you doing now to get her to sleep? What happens when you go in to her? Any new teeth coming in? Any changes around the house?
I agree that you shouldn't put her down any later. It sounds like she is just testing and maybe fighting bedtime, in which case you'll just have to remain firm and consistent.
Post back with the details, and we'll try to help!
Carrie