The Truth About Stacey (Baby-Sitters Club Graphic Novels #2) by Raina Telgemeier

Poor Stacey. She just moved to a new town, is still coming to terms with her diabetes, and is facing baby-sitting problems left and right. Fortunately, Stacey has three new friends — Kristy, Claudia, and Mary Anne. Together they're the BSC, and they will deal with whatever's thrown their way...even if it's a rival baby-sitting club!