Awakened - The Guardhian Series, #1

One choice may cost her everything. Unlike her brother, Niamh didn't possess the shapeshifter gene, but she still felt that part of her was missing. On her thirteenth birthday, an ancient power awakens inside of her. With new responsibility thrust upon her and no time for proper training, Niamh must do whatever it takes to keep the realm and its inhabitants safe.  Her father knows more than he lets on, both her powers and the dark evil trying to overrun the realm.
Just when she gains some headway, another foe makes itself known. With little knowledge and only her catalync as a guide, Niamh must protect the realm from the growing darkness or save her loved ones from the devil itself.