Have you got a regular time in place that she goes to bed at? I'm wondering if reading what other people do that does work might help if it gives you some ideas that you can incorporate?
I borrowed bits from the baby whisperer - no crying, avoid eye contact, don't talk, be persistent and consistant and have found it very useful.
DS (now 18 months) needs to be in asleep 8 at the very very latest. So, at about 7 his dad takes him up for a bath. They have a really good play in the bath with lots of splashing and giggling and being silly. It gets the last bits of energy out. I guess this could be substituted with physical play if a bath every day doesn't suit.
Whilst he's in the bath, I shut all the curtains and blinds upstairs and do everything I can to shut out as much light as possible.
DH takes him out of the bath, dries, PJs on, then into our bedroom. WHen he was younger we used Johnsons nighttime cream too, which smells delicous and adds to the picture that we're presenting to DS that its time for bed soon.
Then DH sits on our bed with DS in front and between legs and they read books together. Now, as we've done this since he was four months old, he loves books and the stories and sits and listens to about 3, depending on length, but any calm games or singing or story that you can replicate night after night would do. It gives him time to relax and cuddle after his warm bath and gets him in the right mind-set for going to sleep.
Then, he has a (spouted) cup of warm milk (yes, its after he's cleaned his teeth and we're trying to move it to before, slowly slowly catch a monkey is my favourite phrase!!) and DH takes him into his bedroom.
DH used to stand and rock him till he was nearly asleep, then put him down and pat his bottom. But now, quite often he's so ready that he asks to be put in his cot, rolls over and goes to sleep! On the other hand, other nights he gets put in and promptly stands up again.
We have a chair next to his cot that DH sits in, avoids eye contact but provides physical comfort - pats, etc. If he doesnt' lie down again after a couple of moments, DH lies him down but says nothing and still avoiding eye contact...this can go on for up to 20 mins but we always win.
Maybe there's something here that you could try?