Otherwise Known as Sheila the Great by Judy Blume

Sheila Tubman was a side character in Tales of a Fourth Grade Nothing. Now, she's front and center. She has a little bit of a lying problem along with a fear of swimming and dogs. Her family is getting out of the city for the summer and watching another family's house. And dog...

She's going to make some new friends this summer, including Mouse who isn't going to put up with Sheila's lies, but is surprisingly good at not calling her out on it. 

Four stars

Fudge #2

This book came out in 1972

Follows Tales of a Fourth Grade Nothing

Followed by Superfudge

Borrowed as audiobook from Libby

Opinions are my own