The fairy godmother's way of ensuring a happy ending. She goes to Edward's wedding, blows a trumpet in the middle of the ceremony, and then signals Cinderella to walk down the aisle. Then she arranges for the other bride and Edward's cousin to fall in love, allowing Edward and Cinderella to get married.
Cinderella's stepmother and stepsisters force her to become their servant, set her impossible tasks hoping she'll fail, and make her do her chores over again for the most minor of reasons. When Cinderella and the Prince are reunited, she has a chance to get revenge on them. Instead, she forgives them.