Nevermind-Found it! (I need help to remember a children's book title!)
Update: By searching Amazon for titles similar to those in the replies, I found it! It's Bink and Gollie by Kate DiCamillo and Alison McGhee, with illustrations by Tony Fucile. Coincidentally, we checked out another of Kate DiCamillo's books (Louise, The Adventures of a Chicken) from our public library, and we own the 6 Disney/Pixar movies Tony Fucile was an animator for. I'd been going nuts for the past week trying to remember this title. Thanks so much for your help!
One of my kids took out a book from their school library (grades K-2) this past school year. In spite of my phenomenal memory and organizational skills ::guffaw, guffaw:: I cannot remember the title or where I wrote it down, although I do remember writing it down. It was about two girls who are friends. I think one says the other can't do something (possibly involving roller skates?) unless they do or don't do (or maybe wear?) something else, and they end up not playing with or talking to each other for a little while. The one who tells the other she can't do [whatever] gets lonely or bored, and they make up and play together again for the end.
I think it had a few chapters or separate titled parts. I think the title was the two girls' names. It might be part of a small series of books. It was a newer book.
At least, I think that's how it went. I really, really liked this book when I read it to the kids, and they did, too, but I can't remember what it was, and they have no idea what I'm talking about. Since I cannot afford another mark against the condition of my sanity, I have to prove that this book exists.
Can anyone help me, in spite of what's probably the worst book description ever? I'm pretty sure I'll know it as soon as I see/hear it.
ETA: The book was illustrated, but in black and white, and not like a picture book. More like in a Roald Dahl children's book, with some illustrations on their own page, and others a bit more scattered in with the text. The illustrations were not drawn in the same style Quintin Blake (Dahl's oft used illustrator), though, they were smoother. And the book was shorter than most (if not all) of Dahl's children's books.