She wanted to get out of there, so she tried using her magic, but nothing worked, until a ghost of Nightmare Moon appeared and took pity on her. Holly feared her the most, even more than Chrysaliss minions. Nightmare used some of her power to turn her evil, but it wasnt for revenge on Chrysalis. It was to give Nightmare some help and another ally, but not an apprentice. She was then renamed Christmas Nightmare. Every year at Christmas, she would terrify and rampage throughout Ponyville, making everyone elses Christmas miserable.