Momof6, Wannabe pretty much covered it. DD and I had such a good time that night. And it's funny, because as much as she had been looking forward to it, she got the jitters at the last minute and wasn't sure she wanted to go. I told her we'd just go and look in, and then she could decide. Of course then she really wanted to. She had some specific questions she wanted to ask Cinderella, but she was too nervous to ask them, so I did it for her. You'll be happy to know that yes, Cinderella does have a potty in the castle. (DD wasn't sure because she'd never seen a potty in the movie.) And yes, Cinderella is friends with the other princesses. In fact, Belle sometimes comes over to read stories to Cinderella and Prince Charming.
BTW, this was her one activity with just Mommy, nobody else. Her 10yo sister got to swim with the dolphins at Discovery Cove, and her 12yo brother got a day at the park of his choice (Islands of Adventure.)