@feha : in the webnovel, she was a white mage with (IIRC rare) healing and barrier magic, but her brother was talented in multiple elements of offensive magic, her parents wanted the child who could kill squads and small forces on 1 blow to inherit, against tradition grandparents objected and it caused infighting that weakened the nation.
As the first wn chapter has a translator note apparently stating that it seems only the offensive magic was referred to as magic, and her healing and barrier was described with a different term closer to power.