Caught in Time by Sheron Wood McCartha

Travel back into a medieval past… on an alien planet. Rowyna Grae, cloned time traveler, is sent on a mission to kill the king who is thought to have originated mutant Talents.

But mistaken identity leads her astray, and she finds herself falling in love with the man she was sent to assassinate. Within a day, she is fighting for her life in a barbaric land against robbers and rapists. However, she has to be careful, for any action or forbidden knowledge that she uses could change the future she has come to save.

But how can she save that future if love and circumstances keep tripping her up?