The Golden Enclaves by Naomi Novik

Almost singlehandedly–although backed by an increasingly large cadre of genuine friends–El has changed the nature of the Scholomance forever. But now that she is back in the real world, how will the lessons she learned inside the school apply? Will her grandmother’s prophecy come true? Will she really spell the doom of all the enclaves forever? As the quest to save her one true love ramps up, however, El is about to learn the most significant lesson of all–the dire truth on which the enclaves and the whole stability of the magical world are founded. And being El, she is not likely to let it lie…