Vengeful Prince by Mary E. Twomey

Lilya must choose between redeeming her broken world…or saving her life.

When the three princes of the battling territories set out to redeem the land their parents have ruined, Destino rules that the only way to unite the people is for him to marry a woman from one of the enemy territories—the land of the fae.
Lilya is thrust into the limelight, stepping into a world where she knows no one and stands out as a target, like any fae would in a land of vampires. Having all eyes on her brings her worst fear to light: that the secret of her deadly magic will be found out, and she’ll be hunted down for her many crimes.
The princes and Lilya soon realize that their push for peace is turning into an act of war between the vampires, shifters, and fae. Defending their choices is one thing, but defending their lives sets them on a perilous path from which they cannot turn back.