Vote for Orison by Brandon Gray on KindleScout:
Can she kill her only chance at love?
Shunned by the other dryads, Aurianna lives unloved and alone. When Branson King, a human, crashes into a tree and kills her grandmother, the dryads compel Aurianna to take an oath that she will find and kill Branson--or die herself. But instead of finding a hardened human heart, Aurianna discovers friendship, affection, sparks of passion—along with a deadly secret. Soon Aurianna is confronted with a harsh reality: in order to live, she must kill the only person that might ever love her. https://kindlescout.amazon.com/p/I04XCDY47P0T