Politically Incorrect (Camp Confidential #23) by Melissa J. Morgan

When Tricia Bennett, the First Daughter of the country's first green president, arrives at Walla Walla, Natalie is assigned to show her the ropes. Walla Walla is going green this summer, so Tricia should fit right in. But when a national newspaper shows up on camp grounds and finds a pile of used Styrofoam containers behind the girls? bunk, somehow Natalie gets the blame. And you'll never believe who the culprit is!

Dog Gone note: This can read as a stand alone, despite it being a part of a series.