Potty training with Cars

Potty training has been going well but for the last few weeks she has not been quite as into it. There have been more than a few accidents on the floor while wearing big girl undies. Because she has been totally obsessed with the Cars movie and all the characters so I bribed her with cars underwear if she went potty. Well that worked like a charm and she went.
For the last few months Selena has been doing pretty well, she will go to the bathroom, turn on the lights, step up on her stool, go potty, wipe and flush. Then grab a penny(since we give her money to go potty) turn out the light and put her penny in her piggy bank. Joe and I can just sit back on the couch and listen. So the money still works but not as well so I got all the Cars character matchbox cars at the store and some Cars underwear. They only have Cars underwear in boys, how sexist! I put them all in a bowl and when she has to go potty and goes by herself she can pick something out of the bowl. Well the first night I put her in big girl underwear and she got up when she needed to and went. This just proves she can do it and with the right kind of motivation she will. Within three days she had her favorite Cars and a few pairs of Cars underwear. Last night she went potty for money, no prizes so that's good.
She has been doing great at school potty training so they moved her up to the bigger kids room where they are all mostly if not already potty trained and she is very proud of that.
Now if we could only get her to go number two in the potty we would be good, this bodily function seems to scare her through.