Irenic (The Harmonia Chronicles) by Jarah Aurel

She lost her love. She lost the war. Now she’s losing herself. All her life, Malia was taught to be a fighter—to be unbreakable. But those mantras mean little when there’s nothing left to fight for. With Keahi gone and the Ghosts vanishing as quickly as they appeared, no trace left behind, Malia finally breaks. Haunted and hollow, she tries to disappear too—but the war isn’t done with her yet. As secrets surface and mysteries unravel, friends turn to foes and loyalties shift. Now, Malia must face the fractures in her mind and decide whether she can fight one last time or be lost to the darkness for good.