Forsworn, The Bittersweet Vampire Chronicles, Book 2 (The Bittersweet Vampire Chronicles #2)
Ava Ivy

For a "not nice, bully", Ariel supposed the youngest vampire brother was alright. It was his oldest brother--who was supposedly away on business--that Ariel intended to kill as soon as he returns home. Under false identity, she awaits his eminent arrival, busying herself by saving, healing inadvertently charming countless Fraser's, unaware of the fervor of interest she's stirring.
But when Ariel overhears a plot to attack her clan, she flees in order to warn her beloved family. What happens next will change the course of her life forever...