Severance of Minds by Jodie Angell

Rule or revenge? The path has never been so uncertain.

Evalyn is Queen of Arogath, but the loss of her unborn child blasted a crater in her heart, and now she finds herself in an unknown land with a magic of its own. She cannot bear to see her friends or Felix, the man she’d given her heart, for their betrayal only deepens the cracks in her soul, threatening to tear it apart.
In Swynvale, Evalyn seeks answers—a way to destroy her foe for good. But such magic comes at a cost—and the price could destroy her. And with the dark mage responsible for her heartache anticipating her every move, Evalyn must decide what to fight for: revenge, her family, or her kingdom.

Goodreads