Girl Power by Melody Carlson

Written by bestselling author Melody Carlson. Meet Morgan, Amy, Carlie, and Emily. They all live in the trailer park at 622 Harbor View in tiny Boscoe Bay, Oregon. Proximity made them friends, but a desire to make the world a better place—and a willingness to work at it—keeps them together.

In the first book of this series, Project: Girl Power,bullies knock Emily from her bike on her way home from school, so the girls start walking together because there’s safety in numbers. With help from other people in the park, they set out to beautify Harbor View. In book two, Project: Mystery Bus, the girls begin summer by working to clean and restore their bus to use as a clubhouse. And thus begins the Rainbow Club.