Dana Cheplin is the 8-year-old daughter of Mrs. Cheplin and the older sister of Adam Cheplin. She was recently diagnosed with diabetes & uses a glucose test kit. She attends the Miller School with Adam and needs to be picked up from the bus stop at 3:15 p.m. sharp.

Dana's best friend is Mandy. She takes piano lessons and knows how to touch her nose with her tongue. Stacey suspects that Dana uses her diabetes to get her own way and make her friends guilty. When Dana's blood sugar level becomes dangerously low, Stacey takes her to Dr. Johanssen, who says that her insulin dosage probably needs to be adjusted.

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