I read this story from a book. I don't own it.

There was a little German girl named Gretta she had white blond hair brilliant gold eyes. And most importantly long teeth. She was a transfer student to America. But once there she did something she shouldn't have done. She fell in love. In love with a boy that already had a lover. Which grew a rivalry between Gretta and Brittany.
Then the play came. Gretta got to be Cinderella while Brittany was a stepsister. The boy wanted Gretta to stay for the party after the performance but she said she couldn't stay up past midnight. Overhearing this Brittany changed all the clocks back an hour and told Gretta they would tell her when it was 11 so the party went well until it was 12 ( or 11 in Brittany's case. And Gretta felt strange and asked someone the time and she said 12:00. Gretta screamed as her face turned hideously like a dog's then the Gore began.
The police found nothing but a shoe on a stair like a sick momento of Cinderella. But there was no problem finding the foot. Brittany's foot was snug inside.