Kingdom of Souls by Rena Barron

Arrah is a young woman from a long line of the most powerful witch doctors in the land. But she fails at magic, fails to call upon the ancestors and can't even cast the simplest curse.

Shame and disappointment dog her.

When strange premonitions befall her family and children in the kingdom begin to disappear, Arrah undergoes the dangerous and scorned process of selling years of her life for magic. This borrowed power reveals a nightmarish betrayal and a danger beyond what she could have imagined. Now Arrah must find a way to master magic, or at least buy it, in order to save herself and everything she holds dear.

Book by author Rena Barron.