The book is a juvenile chapter book from the ’70s or ’80s. Called something like _Best Friends_. It’s about a girl who loses her best friend to another girl. I remember that she eats Chinese food with a new friend at the friend’s restaurant. She also participates in a puppet show from Alice in Wonderland and she is the Red Queen. The former best friend comes crawling back after a fight with the new girl but she realizes that she likes having lots of friends vs. exclusive to one best friend.
Best Friend, by Shirley Simon. Scroll down past the book covers in this link for a detailed description.
https://cliqueypizza.wordpress.com/2011/03/10/quirky-covers-best-friends-by-shirley-simon/
OMG thank you! I’ve been trying to remember the name of this book for AGES. One of my favorites as a little girl.