The Changeling, Volume 2 by Tina Lugo

Luth is a lycan—half human, half wolf—ostracized from her clan. In order to prove herself, she enters the trials to become Heketi, an elite warrior hand-picked to serve as defender and peacekeeper. But in the grueling challenge of the trials, she discovers something else entirely. She is the Dark Star, destined to bring ruin to her land. Can she fight against the demon lurking inside her, or will tragedy win out?