Uprooted by Naomi Novik (2015) Del Rey 

A young woman, Agneiszka,  is of an age to be among those selected once every ten years by a local wizard.  Everyone expects her best friend, the prettiest girl in the valley to be selected, but instead it is her, the homeliest, most disaster-prone girl in the valley.  When she questions why he selected her, in his tower, he tells her she is a witch.  She turns out not to be any witch, but one with Baba Jaga's capabilities.  And between them they rescue the Queen, who has been a captive of the Wood for the last twenty years and deal with all the disasters that come to Agneiszka so naturally.