Auden Pendergast and the Meaning of Life

I'm not very good at titles of summary's, but I will assure you this isn't about the meaning of life, it's about a girl who travels from the US to go to Hogwarts for 5th year. She stays will the Weasley's before turn and become good friends with the twins, but when she arrives at Hogwarts things take a turn for the worse. How can she recover?