This is actually a short story, from a collection of fantasy/SF stories probably published in the early-mid 1980s, possibly a little later.
It’s about a woman who rescues a fairy from her cat. The fairy casts a spell that, at the next full moon, turns her into a mountain lion. She escapes from her house, leaving blood on the shredded sheets, into the country, where she learns to hunt for food and encounters a male mountain lion (and a zookeeper) at a zoo. Meanwhile, stories of her disappearance center around an animal attack. After another cycle of the moon, she turns back into a woman.
Yes , I read that Story.
It is in the Anthology fom Marion Zimmer Bradley called Greyhaven,
the Story is called: Cat Tale, and is by Vicky Ann Heydron
Yes, that’s it! Thank you so much.