Under the Lion Star by Kathryn Moore

The King and Queen of the elven nation of Fjorn are dead. The country now looks to Leor for answers. The tenuous truce with the humans of Krannar balances on a knife’s edge, his siblings are in shambles, and his council is pressuring him to take a wife. All of this is further complicated by the discovery that someone has been trying to kill him since he returned from the battlefield.
Zialda has struggled to find a place for herself in the realm. Since her mother’s murder, she’s devoted herself to caring for her five younger sisters. As they all enter adulthood and chart their own paths, Zialda finds that she has no idea of what she wants for herself. When an unlikely opportunity presents itself, she seizes it. However, a threat lurks in the shadows that could shatter her new life before it even begins.