Once upon a time there was a girl called Cindy. She had to work very hard all day while her lazy sister did nothing. One night her sister went to a party at the palace. Cindy was very sad because she had to be at home. Suddenly, a fairy appeared and told her that she could go to the party, but she had to turn back by midnight. The fairy also changed Cindy’s rags into beautiful clothes. Then Cindy went to the party and danced with the Prince. At midnight she ran back home, leaving one of her shoes on the dance floor. The prince wanted to see her again and went to every house in the village until he found that the shoe was the right size for Cindy. She and the Prince got married and lived happily ever after.

Where did Cindy’s sister go one night?