Moss and Clay (Mab's Doll Book 1) by Rebekah Jonesy

Moss, Clay, and Blood A doll, crafted and given a mission by Danu, is brought to life by human and Fae blood. Blood daughter of Mab, Queen of the Fae, Gillian must track down the fae in the Americas and bring them back under Fae Law. No one knows what is holding them there, or why no other rescue mission has returned. Not even the gods that sent them. Gillian must return the fae to the Underhill, or send their souls back to Danu.