How does Mattie change from the beginning to the end of Fever 1793?

Over the
course of the book, Mattie develops from a regular teenage girl into a mature young
woman.

When the story begins, Mattie has to be roused out of bed by her mom,
who needs her to do some chores. But Mattie is incredibly lazy and deeply resents having to do
anything that might resemble hard work. Contrast this with...