Rebelious at the age of 3!!!

So we have gone a full week without diapers, and were doing so well. But today something happened. It was like she was possessed by another spirit. Madison has been having 1-2 "pee-pee" accidents a day and staying dry through the night. Thought we were on the right track, but today there was NO end to how many times she wet her pants. She is being stubborn. I took her to the potty this morning and she refused to sit on it. She had just woken up and her pants and bed were dry. So she kept her legs stiff to prevent herself from sitting on the potty. As soon as I stood her up again she looked at me and pee'd all over the floor. What is wrong with my kid? Why is she doing this to us? I made her really mad tonight b/c I put a "baby diaper" on her hoping that she will get the point. Jeremy and I are exhausted with trying to potty train her, but she has to be to go to school. If anyone can offer anymore suggestions, we are all ears! We've tried all sorts of rewards, and praise for her when she does go to potty. We tried to not make a big deal about the accidents, but now its out of hand. When we are out away from home, she does great. She tells me when she needs to go potty, but when we are home she doesn't. Help!!!!! Please someone!!!! Help!!!