M.J.
My child did the same thing. I used Potty prizes, it took about 2 weeks for him to get it down, but potty prizes worked. Every time he would go on the big potty, he would get a small prize (hot wheels) and after 2 weeks of him going consistently, he got a big prize.....(remote controlled car) It was the best thing ever and he is still going and the potty prizes have diminished. It is worth a shot. You just have to find something that she REALLY LOVES would do anything to have, and that is what you use for the potty prize. I hope this helps!!
M.