This story is told from the point of view of Wren, Leaf, and Ivy. Wren and Leaf lived in the same village. They were siblings. When she's 8 years old, the dragonmancers (the leaders and protectors of the village) say that the the dragons demand that she be sacrificed.
This is the second Legends book of the Wings of Fire series written by Tui T. Sutherland.