She wakes up in the wintertime and travels through the mythical world accompanied by season-of-year related animals: wolf, then black panther. Story features at least two Celtic demi-gods and their mother, a snake-woman, weaving the fabric of reality.
Probably mid 80s.
Edit in response to comments below:
- I read it in early nineties, I believe, in Polish translation. 80s are a kinda wild guess. The author was female, I am almost sure.
Some more random elements:
One of landmarks was called Randolph's Ditch -- one of the few common elements connecting our reality with the mythical one.
The dark-haired demi-god was her chosen partner, the blond one was chasing and even tried to rape her (unsucessfully, as the magic plant hidden in her clothes made him, ekhm, unable).
The whole story starts in the winter, and as the summer arrives her familiar changes -- or is replaced. Also, the blond-haired
character prevails over the dark one, only to be killed by a wild hog at the end of summer.
The final (?) scene is her giving birth to Arthur.
This is all I can recall, sorry.