Witchcraft and Fury by T.T. Greenshaw

Solar Carpenter is the first girl to study magic in a hundred years. And maybe the last.

For over a century, only high-born men have wielded magic in Ashwood. The nobility’s youngest sons are taught by the kingdom’s wizards in roving magic encampments. Witchcraft is forbidden, and the women who practise it persecuted.
Yet change is coming.
Solar Carpenter, a girl providing for her family any way she can, is plucked from her life of menial work and petty theft to study at an elite encampment. Under the guidance of one of Ashwood’s greatest wizards, she will learn in the field as a witch-in-training, using her powers to protect the kingdom.
Or die trying.
But what if something other than destiny lies behind her rise to magical prominence? Is Solar merely a pawn in an intricate game of thrones and power? Or the greatest force for change in a hundred years?