Gradually, Lynette stopped inviting me over after school. One day, on my way into the girls' bathroom, I overheard Lynette and Shelley Abrams discussing their after-school plans at Dale's Ice Cream.

"This afternoon is going to be so much fun," said Lynette. "It's going to be you, me, and the rest of the `Fab Thirteens.' Just remember, no twelve-year-olds."

I heard a toilet flush and scurried into an empty stall. Their giggles felt like needles. I heard the sinks running and knew they were tossing their locks in the mirror. This couldn't be happening. But I was quickly getting the picture that it was.

What central idea do the details in this excerpt best support?

canceling plans
growing up
being left out
being in a club