In the part where Jodi goes to the dance class (not the ballet class, the faster dancing class where they warm up to the mandy moore song "candy"), the teacher just plays the music and tells them to dance however they want to. They all do the same dance, but how would've Jodi known all the dance moves, perfectly? It was her first time there! She didn't even know what classes were possible to take. Its not like she could've followed someone else because she was in the front too!