J.,
I have the same problem with my 5 year old son. I've recently consulted a child psychologist and she suggested that I try a reward system for him not getting up in the middle of the night. She said to slowly wean it down. For example, if he usually get up 3 times a night, reward him if he only gets up twice for a week, etc. I haven't tried it yet because we had to work on some other issues first. I'll let you know when I do.
Also, you may need to adjust the reward for different situations. When the sticker board stopped working for my son I went to the dollar store and bought a hand full of small dollar toys, balloons, lollipops, etc. Also, I have a dvd player in my car that he enjoys. I use that as a reward too, or take it away as a penalty. I would only use penalties when she is going out of her way to not obey you when you know she can or already has in the past.
Good luck. I hope this helps.