children's book-- grandmother becomes tiny and jumps on couch with grandson?

[Abigail]

Hi! my mom read me this book around 1980, max 1982. all we remember is a grandmother going to spend time with her grandson, and for some reasons she shrinks/becomes tiny, and we remember a scene where she, tiny, is jumping on the couch. thanks!!

[Becca]

Good Night, Fred by Rosemary Wells?

I'm basing this on a similar query that was solved by another user on this forum - https://www.goodreads.com/topic/show/...

[Rainbowheart]

There's also a video of the whole book on YouTube....

https://www.youtube.com/watch?v=-YqA-...