My kid was like that, too, at 2. Still is, now that he's 5. Takes forrrever in the bath, wants to stay until his fingers AND toes are all shrivelled up, then he can't RESIST running around after the bath - it's like he gets his second wind. Usually we have to tackle him for pajamas.
Then at LEAST 20 minutes of stories... Oh, and we have a nightly ritual of bringing the cold glass of water to put on the bedstand, because otherwise that would be another trip downstairs. He's not doing it in a disrepectful, sassy, manipulative way. It's just that he REALLY IS wide awake - it's not like he's "being stubborn" or "just fighting it" and falls asleep as soon as his head hits the pillow. Because once he *is* in bed, I'll hear him rolling over and sighing (just like *I* do when *I* can't sleep) - sometimes for a long, long time.
I think some children are naturally more nocturnal than others. I always say my son will do GREAT in college, if he can make it through elementary school! He'll be up for those all-nighters - and no caffeine! :)
I'm joking, but the reality is that we *know* people differ greatly this way, and many "night owl" adults are very productive. We NEED people to work graveyard shifts in our society, from 911 operators to Nobel Prize wining scientists. And many writers, professors, police, engineers, journalists, etc, etc are able to work odd hours. Adults can manage it, but unfortunately for kids, schools aren't that accomodating.
If she's not crying and fussing, but lying in bed talking to herself, then you can't really fault her. She just can't fall asleep as easily as some kids. Soon she'll be up with a nightlight browsing her books, and a few years later, she'll probably be reading deep into the night. Don't come down too hard on her when she drags herself downstairs all groggy, as she probably will do when she's school-aged. There's only so much you can do. And the grown-up world is much more accomodating.