The Truth About Stacy (The Baby-Sitter's Club #3)
Title: The Truth About Stacey
The truth about Stacey is that she has diabetes, a secret she keeps from everyone except her new friends in the Baby-Sitters Club. But Stacey's secret causes a lot of problems, and she has to miss a lot of club meetings. Can she find a solution before her new friends get sick of her disease?
Author: Ann M. Martin