Katherine O-Dell is one of the Fox's many neighbors. She is 9 months old. Paige often babysits for her, and Katie does not make it easy. Paige once unintentionally taught her two curse words. Another time, Katie is excited enough to wear her fancy new dress while Paige comes over, but while Paige sleeps on the job, Katie plays with her mother's scissors, chopping up her new dress. So Paige tries to convince her to come up with a story like Paige was playing Mozart or flashing cards, but it ends up being "flashing Mozart." Therefore, Paige has to buy a new kiddie dress and spend hours apologizing to Mrs. O'Dell for sleeping on the job.
Another time, Paige gave Katie some chocolate cake against her own will, which makes Katie literally bounce off the walls, causing Paige to say she "created a gas molecule.
Paige once unintentionally gave her M rated video games.
Another time, starting from when Paige arrives to baby-sit, Katie keeps yelling, "Blue's Clues!" over and over for four of the five hours straight, but she doesn't give in because Mrs. O'Dell had said she could not watch any television or videos while Paige was there as a punishment for misbehaving more than usual that same morning. Eventually, she mentions, "Dawson's Creek?" when it is clear that no number of times she says, "Blue's Clues" was going to get Paige to let her watch television.
Katherine is usually called Katie.