From Random Family, by Adrian Nicole LeBlanc
Mercedes's obvious success at camp pointed to Coco's failure to care well for Mercedes herself. Mercedes seemed to intuit this and began to revise her camp experience, proclaiming as boring activities that hours earlier she'd loved. She downplayed the importance of her new friends. She denounced her accomplishments, just as her mother had at Thorpe, when she was on the brink of striking out on her own. Mercedes swore she was never going back to the awful camp. Then, like a tittering schoolgirl, she called her counselor, Beth, with whom she'd been affectionate, "fatso" in Spanish. Coco laughed heartily. "I know I shoudln't," she said, but she did, covering her mouth. -- p. 274