I am Morgan Le Fay by Nancy Springer

Morgan was Always destined to be a Fay. She had eyes of a changling, She found a Druid Stone, and She was discovered by the Fays of Avalon. When her father is killed by Uther Pendragon, She and her sister Morgause watch their mother surrender to him. Morgan felt a deep burning hatred for him, especially because she and Morgause were left behind with their nurse. Soon after that her mother gives birth to a baby boy, and everyone is invited to celebrate his birth. When Morgan goes and sees the baby boy she hates him. But her nurse tells her "not to think such terrible thoughts." Later Uther Pendragon dies from a sickness and everone is fighting for the throne. So the nurse reveals her true identity, she is a white witch and she has to take them to her home. While they are traveling to the nurse's home they meet up with Thomas, a messenger boy who helps them go to their destination. After he leaves Morgan recieves a calling to go to the Fays of Avalon, and while she is there she finds her mother. But when Merlin comes, Morgan must chose who she wants to be, A fay, or a sorceress.