Her

"It is said that when a werewolf becomes of age, they shall change, those that do not, do not belong in the pack and will remain servant of the pack, but all wolves will shift, it is rare that one does not, it's so rare that's it's unheard of a wolf not shifting"

Clair is part of the Nightshade pack in a small town and village deep in the woods hidden from the public. When she's 18, she doesn't shift like the other wolves in her pack and therefore is the family and pack servant.

She's now 20 years old and things start slowly becoming strange for her, and everything starts unfolding twisting around and soon enough the truth starts showing itself.