Hive mind please help!
When I was a child (probably late 80s, could be early to mid 90s), I read a book about a girl who I think was called Nia. She was living or staying in Wales and there was some connection to Welsh myths / the Mabinogion. I seem to remember she cut off some silvery curtain fabric to weave into a tapestry and some of the myths related to horses.
And that’s all I can remember! Anyone recognise this vague description?