I might be able to help. I went to a weekend conference a few years ago and learned a lot. Part of what we learned was how to get "centered" and where we needed to be in order to learn or even to sleep.
You need to start by finding out how your daughter feels when it's bedtime. We were taught to gauge it by the terms "high, centered and low". Does she feel wound up and unable to come down enough to sleep or does she feel too tired or too low?
Once you understand the different levels, you can begin to think about what you do to become more alert or more relaxed. For example, my husband can hardly go to bed without first sucking on some ice. It gets him relaxed and centered. After that he goes right to sleep. We all wiggle a foot or chew on a pen to stay alert in meetings. Well, maybe not that exactly, but pay attention to what you use to stay focused. I guarantee you do something, even if it is just sipping coffee or a cold soda!
Somewhere I have a sensory checklist. It helps you identify the things that help you get where you need to be. It's amazing! When my DD was having trouble sleeping, we figured out that she was actually too low to go to sleep. So we tried several things before we found her answer. We took a huge, plastic pretzel container from Sams. We put a little soapy water in the bottom and gave her a piece of plastic tubing. We told her to blow until she filled the jar with bubbles. It seemed to get her where she needed to be. It can be as simple as that.
PM me if you want my email. I know this sounds a little nutty, but it really works. I'd be happy to see if I have any ideas that would help in this specific case.