Maybe the third time is a charm

We had tried to potty train Mimi before, actually, about a year ago. It didn't go well. She peed in her potty a few times, but then started peeing on the carpet, which is kind of hard to clean up. Eventually she started to use her potty as a place for her dolls to hang out, and then Buddy ate all the chewy parts, like the seat, and we gave up. A few weeks ago, we bought a musical potty and started to try again. We figured that she's three now, and is probably ready. Of course, Mimi would differ. She would get all crabby when we talked to her about the potty. We would say, "Now that you are a big girl, you can go potty on the big girl potty" and she would freak out and scream "No!" Now that she is approximately the size and appearance of a five year old, we thought it might be time to get her out of diapers. Didn't go so well. The only way I got her to stay on her potty was by giving her a mini M&M ever twelve seconds or so. She peed once, and then refused to sit on it again. This is getting ridiculous. Pretty soon she will be able to change her own diapers.