It's done at the store just on the other side of the castle. You need to be the first one to the store that asks to wake her up. They just do it the one time, so it's a total luck of the draw, get to the park at the opening and just head right to the strore.
It's pretty cute, my kids did it, they tap on her box with a wand and she flys all around the store. The kids get a certificate and some stickers