She belongs to a family where witchcraft is hereditary. These families are quite rare. Their fantasy world is quite similar to our real world and magic has very little power but is pursued by law. Her witchcraft is very occasional and more like a psychic power. She is forced to flee her home accompanied by her young friend-lover and they travel through several countries that all have a strong similarity to the Europe of the 16th or 17th centuries.
The most interesting character in all the novel is never seen. He is a kind of prince, political reformer and heretic whose many triumphs and failures to change the system have strongly influenced all countries by which the young couple travel. At the end of the novel news arrive that this prince has achieved a great military victory.
I read this novel about 1980 but I cannot tell when it was written. I reckon his style was a bit archaic but it was a lot more elegant than the usual pulp stories.