just keep re-enforcing her good behavior with good reactions, and IGNORE the bad behavior(to a degree). If she doesnt get attention from it, she'll like the attention she gets when she does go in the potty.
With my oldest daughter...first of all I kept the little potty in the living room.
and she NEVER wore pullups, panties only.
If she peed on the floor, she had to go "help" clean it up.
(not really, but she thought she was helping, like getting the towels etc.)
i just kept an eye on her, and if she seems like she wanted to dissapear, it meant she had to do #2, i would snatch her up, get her a book and/or a movie and put her little butt on the potty till she went.
It literally took a couple weeks, of course their were accidents, but the idea was there, and she TRIED to make it. I never really did the movies or books, except if we saw kids on tv or in books, i would say, "see this little girl, shes big and she doesnt wear diapers!" ETC.
sorry so long, good luck! and relax it'll happen!