Potty training snags?

My 2.5 yr old started potty training pretty well...we've now hit the much talked about snag in cooperation. She gets stckers that add up to a prize. M&M's have also been added to the stickers to help keep her interested. Now that doesn't work either. She announced to me today (not for the 1st time) that she was done using the potty. What has worked for you guys? Just let her rebel for now & wait for her cue to pick back up, or try to reinforce it somehow? She's very smart & I know that she "gets" it, I think she's just honestly not at all interested after the excitment wore off. :)