If it was me, I would get tough. I would put her in her bed and leave the room, if she gets up, you go and put her back down. They say it only takes 3-5 nights to change a pattern... so I'd be happy to go through 3-5 nights of hard times. She'll only be stubborn as long as she thinks it'll help her to get her own way, or that she will always get her own way. Once you show her that you're in charge she'll start to respect what you say more.

We did this at a very young age and have never had any issues with sleep. He goes to bed at 6:30pm every night and we don't hear a peep out of him until 8am.

Good Luck!