Mildew On the Wall by Suzanna E Henshon

At one time, fifth grader Millie had a lovely bedroom, much larger than her friends, but over the last few years she had created apparent chaos in it. It became the room that she thought would guide her through her adolescence, the room that defined her identity. To the outside world, it was a mess; piles of clothing, old toys, forgotten books, discarded candy wrappers, dried out pens and pencils with worn points, covered the floor. Old posters barely hung on the walls, along with a two year old calendar. Dusty dolls sat on a dusty shelf. Her sheets and blankets had drifted to the floor. Millie simply could not bring herself to clean her room, no matter how her mother insisted. Finally, her allowance was cut off until the room was cleaned. But, rather than capitulate, Millie began to run secret guided tours to her room for the pre-teen set in her neighborhood for fifty-cents a head. Her first tours were advertised by word of mouth by the kids. Only her best friends had seen her room before, but it was already famous.

At school, Pamela Roberts, neat freak and teacher