SOLVED. Fantasy adventure book with a 80/90 year old human heroine. [s]

[Lorraine]

I came across an ad for it a few months ago and have since lost the link to buy the book but I'm super interested. The book was originally published a few years ago, no more than 5, I think.
The book is something about an old woman living a normal life on earth being called to a fantasy adventure, pretty sure. There may have been cats involved and possibly a butler?
I remember reading that the author writes a lot of short novels and this is one of those.
Pleeeease if you have any information I would appreciate it.

[Kris]

Lorraine, is this book for adults or teens?

What does the fantasy world look like? How does she arrive in this world?

[Sue]

This one? I haven't read it, but the blurb looks interesting, so I've bookmarked it. https://www.amazon.co.uk/dp/B06XCV31H...

[Rosa]

Mrs. Perivale and the Blue Fire Crystal for the easy Goodreads link.

[Lorraine]

YES Thank you this is the one!!!