Misguided Allies. The Void Series, #2

Half-fae Sam Gollet is no stranger to solitary confinement-being a half-fae working as a vampire enforcer will do that to you. She is also accustomed to solving the crimes within the supernatural community inside the Illinois Mystical Reservation when the feds refuse to lift a finger. After being released from Solitary, she finds herself quickly embroiled in the mysterious deaths of leading members of the fae community.
Despite having been ostracized by the fae community, Sam agrees to solve the murders at the risk of her own safety. As the body count rises, she'll be forced to show her allegiance to the fae and prove that she's not in league with Heywood's vampire gang, all the while trying to rebuild her crumbling friendships, avoid rejection from her family, and dissuade the unwanted attentions of a mage living outside the reservation.
It seems like no matter what she does, all they can see is her allegiance to the vampires, leaving her wondering if she is stuck with misguided allies.