The Munroe girls were concealing their chagrin at the defection of the swarthy Fontaine boys, but they were annoyed at the way Tony and Alex stood about the circle, jockeying for a position near Scarlett should any of the others arise from their places.
There are no more uses of "chagrin" in the book.
Show samples from other sources
I bragged about how good our team was and then, much to my chagrin, we lost.
The state cut education funding, much to the chagrin of our school board.