That Girl Lucy Moon by Amy Timberlake 294 p.

Sixth-grader Lucy Moon has never been shy about standing up to injustice. As a matter of fact, there has rarely been a cause she hasn't supported. This year in middle school, standing out is even less comfortable, and, on top of that, her mom has left on an extended photography trip, leaving Lucy at home with her distant dad. When rich Mrs. Wiggins fences off Lucy's favorite sledding hill, Lucy won't stand for it, getting herself in deep trouble with her friends and at school.