Kristy and the Secret of Susan (The Baby-Sitters Club #32)

Kristy starts to babysit an Autistic child, Susan, who goes to a special school. She is trying to convince Susan's parents to stay in Stoneybrook. Susan makes a friend. Thinking it unfair that her new baby-sitting charge Susan gets treated differently because she is autistic, Kristy decides to change that situation. Kristy's new baby-sitting charge is autistic and she wants to show everyone that Susan is a "regular" kid