In The Naughtiest Girl Marches On, Elizabeth Allen is once again at Whyteleafe School, but this time, she is determined to take on new challenges and prove that she has grown into a more responsible and thoughtful individual. She becomes involved in a school march, where she is faced with the task of organizing and leading her classmates. As Elizabeth takes on the role of leader, she learns about the importance of teamwork, fairness, and the responsibility that comes with leadership. However, she faces obstacles along the way, and her rebellious tendencies are tested. Throughout the book, Elizabeth must make important decisions, showing her character growth as she learns to lead by example and consider the needs and feelings of others. This story continues the themes of the previous books, focusing on Elizabeth's journey from mischief to maturity, with plenty of adventure, humor, and lessons to be learned