What is the theme in Our Only May Amelia by Jennifer L. Holm?

Coming of age is the main theme of this story. May Amelia is a twelve-year-old child when the novel begins. May Amelia lives in a place where living day-to-day is a difficult existence. May Amelia has adapted well to her environment and knows what to do when danger presents itself. Despite her knowledge and the adult tasks May Amelia is often asked to do despite her age, she is still a child in the beginning of the novel who often has temper tantrums, such as running away to Baby Island at the beginning of the novel.