Legacy's Price by T.L. Rolston

When Lady Elizabeth Bryne suddenly manifests ancient magic during a duel, she finds herself at the center of an ancient mystery that puts her at odds everyone around her. Complicating matters, her grandfather, the King, has gone missing on a diplomatic mission and everyone seems to believe that she is somehow responsible. In order to clear her name and save everything she holds dear, Elizabeth will have to battle old enemies and face her past.

But how do you face what you can't remember?