Katherine was unfortunately a victim of the legendary truck-sama, it's not like it bothered her. She never even liked her real life and the fact that she was transported into her favorite book with the only mission of ensuring the happiness of her favorite character, it was a big bonus. She had power and wealth, the two major things that made her untouchable. The original Avalon was a depressed and lonely girl, Katherine promised to make sure the new Avalon never had to wonder about her worth ever again. She doesn't care who she steps on or who she needs to destroy as long as she can continue to live the life she wants and have a happy ending. Avalon Darlington deserved that much and more.