Everything you need to understand or teach Princess Ashley by Richard Peck.
Starting high school in a new town, Chelsea Olinger has decided to remain strictly anonymous and not get involved with people. Her plan changes dramatically when wealthy, self-assured Ashley Packard decides to become Chelsea's friend. Through her sophomore and junior years Chelsea overlooks Ashley's true colors and motives and is thankful that she has the good fortune to be in high school society's inner circle. Only after a senseless tragedy does Chelsea see her friend for what she really is and come to understand what true friendship means.