Days of Blood & Starlight by Laini Taylor is definitely a must read. The second in the Daughter of Smoke & Bone series, this story continues following Karou as she reconciles who she is and how far she is willing to go.
Days of Blood and Starlight is the sequel to Taylor’s Daughter of Smoke & Bone which follows a blue-haired girl named Karou one a quest to find out who she really is.