Freedom Hold by Romana Drew

In the Kenned Valley mining colony, Langons control every aspect of Kaylee’s life. Because she is Cadorie, the Langons tell her where to live, what to do, and who to marry. She rebels and is reassigned to work in the mine. Determined to find a better life, Kaylee runs away, searching for the mystical Freedom Hold, where Cadorie live free
But just escaping isn’t enough. Kaylee intends to free her family and, eventually, her world.