Daughter of Shadows and Ash by Ember Johnson

When her loved ones are brutally slain, Alora vows to hunt down the men responsible. Through her journey of grief and revenge, she becomes an assassin. Unintentionally becoming a symbol of hope for the people of the war-torn land.
Fate had other paths for her to take.
After spending a passionate night with a handsome stranger, she finds herself face to face with him once again in the throne room of the Sunnevean King. After completing the king’s assessment, she’s betrothed to the hateful prince, her fated mate who she hasn’t seen since their last and only night spent together.
As dark forces gather threatening to tear two kingdoms apart, Alora must choose: to cling to her vow of vengeance and lose herself to the shadows, or embrace the light of love and risk everything for a future she never dared to imagine.