The Deanna Series
This is three books in one.
It is the Demon in me, Sheriff of the Eternal Law and Becoming the Demon.
Deanna should be contemplating which college she should go to and going out with her friends but Deanna has a destiny. A destiny that is not only going to change her own life but that of everyone else's too.
Until now the coven have protected her but now she must protect them.