Faerie Winter (Bones of Faerie #2) by Janni Lee Simner

Faerie Winter (Bones of Faerie #2) 
by Janni Lee Simner 

Liza is a summoner. She can draw life to herself, even from beyond the grave. And because magic works both ways, she can drive life away. Months ago, she used her powers to banish her dangerous father and to rescue her mother, lost in dreams, from the ruined land of Faerie.

Born in the wake of the war between humanity and Faerie, Liza lived in a world where green things never slept, where trees sought to root in living flesh and bone. But now the forests have fallen silent. Even the evergreens' branches are bare. Winter crops won't grow, and the threat of starvation looms. And deep in the forest a dark, malevolent will is at work. To face it, Liza will have to find within herself something more powerful than magic alone.