This is book number 2 in the Celestial Guardians series.
Celestial Guardians Series Book 2
All Edie Malakim wanted was to be a regular teenager, but she never had an abundance of luck. Discovering you're the answer to an ancient prophecy, the one destined to lock Lucifer in Hell, definitely doesn't qualify as normal either.
As Edie struggles to control her fire-throwing power and not burn everything in her path, she must also be ready for danger appearing around every corner. With the help of Kiah, a fellow Timoreo, and her coyote friend Atlas, she begins to learn a measure of control and a little more of her history.
When an unexpected visitor appears, Edie's world becomes even more complicated as secrets are revealed and old wounds are opened. As her eighteenth birthday and the possibility of new abilities being bestowed on her approaches, Edie must try to decipher fact from fiction and friend from foe.