My suggestion is not to push it. Maybe she's not quite ready. My daughter got a little rebellious and then reverted when I pushed her a little.
With my granddaughter, though, she's 2 1/2 right now, and doing very well on the potty, with only an occasional accident. When we first started with the panties, I had to put the pull ups out of reach, and put the panties in their place. So when we were at home, she could only get the panties.
When she is ready, take her to the potty every 1/2 hour or so. Shortly after I got aggressive about the panties, we made an 8 hour drive (each way) for a family reunion, we stopped every 60 miles, and even though she said she didn't have to go, I sat her on the potty. She did go each time. And we made the entire 8 hour drive on the way there, and the first 7 hours on the way back, with clean panties. The one accident she had when we were almost home was a poopy, and she made it to the potty before she wet.
Hang in there, eventually she will be trained!!!
Edited to add: With both my granddaughters, I've used stickers as rewards. It worked better with the first one than with the second. Stickers just aren't as important to her as they were iwth the first. She ends up putting htem on the wall, or on her sister, or on me, or one of the cats instead of on the chart!!!