All the Pretty Monsters Series by Kristy Cunning

Sheltered from many things in the monster world, Violet lived with the only knowledge that she was a gipsy until she met the four alphas – Vance (Van Helsing), Emit (Werewolf), Damien (Incubus) and Arion (Vampire). Matters were starting to unveil, and regardless of their belief, Violet would be their salvation.

The Dark Side Series by Kristy Cunning

A phantom with no name and recollection of the past happens to be mysteriously attached to four entities. Who’s she, and what’s her connection to the four of them? Anyway, she named them One, Two, Three, and Four, and she has a fantasy plan with them when she becomes corporal! That’s if they trust her.