Tricking Beauty: A Retelling of Snow White - Kingdoms of Beauty, #3

Princess Nixa can't find an assassin willing to take care of her stepmother for her, but the queen has better resources at her disposal. Only days after the king's death, Nixa finds herself running for her life. Though she discovers temporary shelter with the dwarves, her curiosity leads her down a path toward the ancient enemies of her people. Enormous, terrifying enemies. Enemies she had thought only existed in stories.
When the king of these behemoths takes a liking to her and decides to keep her, she's trapped in a demeaning position she'll do anything to escape, even if it means killing the ogre king herself.