How does Matilda Cook grow throughout the book Fever 1793?

Mattie, at the beginning of the book, is a bratty and self absorbed teenager. She then becomes a victim of the Yellow Fever. After that, Mattie becomes a Survivor of the Yellow Fever. Then, she turns into a caregiver. At the end, Mattie grows into an adult. Throughout her journeys and this book, Mattie grows and learns new experiences.