Because Theresse..

Elizabeth have a beautiful voice, she always win in a singing competition.She always chosen in Cores Club (singing club). Theresse was jealous about that. She always dream as a singer, but her voice never more beautiful than  Elizabeth.
Because Theresse jealous of Elizabeth's voice, Theresse go to magic forest. Theresse found a witch that can take Elizabeth's voice and change Theresse's voice with Elizabeth's voice. After the witch change it, Elizabeth's beautiful voice change into Theresse's bad voice.
Theresse was so happy. Now she can win in singing competition and chosen in Cores Club. When Theresse sing in Cores Club, Theresse see Elizabeth waiting for the next. Elizabeth said to Theresse, " Wow, your voice was really beautiful !". Elizabeth turn, Elizabeth singing and singing. But her voice really bad!, she try and try but it can't be beautiful like before. After the stage, Elizabeth cry, she was so sad, really really sad. But, Theresse was so happy.
When the result day, Elizabeth didn't come. Theresse didn't see Elizabeth. Theresse know that Elizabeth really sad because her voice was really bad. So Theresse said to the jury for give Elizabeth a chance. Then Theresse run to the magic forest and found the witch again. Thersse ask the withch to change her voice again to her real voice.
Next day, Jury tell Elizabeth to show again. The result is good and she Go up to level A. Theresse said to Elizabeth what is she doing. Elizabeth forgive Thersse. Now they are friend.