Found: Book with land in which everything was opposite

I remember a book in which a girl traveled to a land where everything was opposite normal convention. For example, if she laughed, they thought she was sad.

Opposite Land?

No, it was not a graphic novel. I want to say it was one of the Oz books, perhaps?

Maybe The Magical Monarch of Mo?

Yes! Thank you so much!

Touchstone: The Magical Monarch of Mo

It makes sense that it reminded me of Oz, as Frank Baum was the author.