What are the motifs in A Summer to Die by Lois Lowry?

Self-Esteem is a recurring idea.Meg Chalmers is having a struggle with self-esteem. At the tender age of thirteen, many youngsters experience similar experiences—trying to build confidence and self-worth and figuring out where they belong in their family and in society at large. Meg has an added obstacle in that her sister, Molly, who is two years her senior, has it all—or at least Meg thinks she does . Molly is blond and beautiful. She is never without boyfriends. She is at ease socially and is poised and confident. She is a cheerleader at school and the cutest boy in school is her boyfriend.