Hiding in plain sight

Katie was broken, but Zack found her. He fixed her, but then he did exactly what he promised he wouldn't do. He left. And when he walked out her broke her even more then she was when he found her the first time. A few years later she had to move to the same city with him. She did not want to see him ever again, so she will do everything possible to prevent that. Katie will try everything in her power to be invisible in his school.