A Gift of Poison — Kate Avery Ellison

As the orphaned niece of a cruel lord, Briand is the scapegoat of the castle. She has few friends and even fewer options, and every day is a struggle to stay ahead of trouble caused by malicious guards and irritable castle servants. Briand is set to be banished to the wildlands, a death sentence, when she when she accidentally unlocks a hidden power and involves herself in a rebel plot and her life abruptly changes. Imprisoned in the company of a band of rebels, Briand must do what seems impossible: call up sleeping dragons in the north. But the fearsome Prince's assassins called Seekers are looking for her, Briand doesn't know if she can trust the mysterious, enigmatic rebel leader Kael, and there might be a traitor in the rebels' midst.