This is a reread from childhood. My mom used to follow me around the library as I filled a huge bag with books; she picked this one out because she thought the title was funny, and because she wanted to get the hell home. I also read the second one, where Glenda loses a bunch of weight using one old weird trick (sensible diet and exercise).
There is a lot going on here, but mostly it's a story about Sara, a girl caught between her weird Berkeley family and her new straitlaced Long Island suburb, and also between her weird friend Glenda and everyone else at school. Sara is so busy peacemaking that she doesn't have much time to develop much of a personality of her own. The plot is pretty thin, but I liked that Sara stays friends with Glenda even though it wasn't socially advantageous, and that Glenda is a good friend despite being weird and kind of annoying. 2.5 stars.