Paranormalcy by Kiersten White
Evie is a very normal teenage girl. She just happens to be able to see through paranormals (Faeries, vampires, werewolves, etc.) "glamours" to the real monsters underneath, and she works for an agency that tracks these paranormals.
I give this whole series (Paranormalcy, Supernaturally, and Endlessly) a B+.
If you liked this book/series, check out Mind Games, also by Kiersten White, who happens to be a San Diego County native.