Sarah ended up being Right for the Wrong Reasons that this camp was bad. She ends up correct that she doesn't mesh well with outdoor activities, that the other girls hate her for relatively small misdemeanors (heck, telling the counselors that a bunkmate had asthma is actually a medical necessity), and that it seems no one cares if she's alive or not. When you find out that the camp covered up two accidental deaths and lie to Sarah about it, you realize some of her instincts were spot-on that the admin was terrible.
The cover to The Curse of Camp Cold Lake is a Red Herring. At first, you think she is supposed to be Della, the ghost girl that torments poor Sarah Maas all story long. Until you read and find Della looks perfectly normal but is transparent (plus, she died when she ran into the woods and got bitten by snakes). No one has ever died in the lakes of Camp Cold Lake because the counselors impose a buttload of water safety rules. The ending implies that Sarah is killed by Briana in the Mandatory Twist Ending, though Sarah was also killed by a snake.
The way Della describes it, apparently it never occurred to the counselors to warn the kids about poisonous snakes in the woods to discourage them from running away, even though two children died via snakebite. Why? Because that would invite lawsuits from the parents about the fact that one would be asking why no one warned the children or had safeguards in place.
