Had she wet the bed? It wouldn’t be unexpected with how often it had been happening recently, and she had dreamed of having an accident in the dream, which tended to correlate with an actual wetting. Her fear rose for a moment, but it quickly subsided as she realized her sheets were dry. Her crotch, though, did feel slightly damp. And why did it feel different, even without the dampness?
She finally remembered the conversations with her aunt and cousin the previous day, and realized that she was wearing a diaper, and she must have wet it. She reached her fingers down her pajama pants, where they felt the diaper and proved her hypothesis. The diaper was doing its job, though; though it was wet, her pajamas and sheets were not.