Request #202

I read this story years ago about a teenage girl who goes to a weight-loss camp for the summer (she calls it “fat camp”) to lose some weight before the school year starts. A weird detail was that the camp specifically included a “terry robe” on the packing list. The weightloss camp is only the setting, the story ends up developing into a murder mystery/misunderstanding (not sure here, but i don’t think anyone actually died in the story). There was a man who was the love interest (he worked at the camp i think), who the protagonist suspected of being involved in some scary activities. Main character’s parent’s didn’t want her to lose more than 10 or so lbs, so she had to sneak away from camp and eat an enormous sandwich so she could slow down her weightloss and continue her investigation. One of the women in the camp used chopsticks in order to eat her meals more slowly.