Who is Kit from The Guernsey Literary and Potato Peel Pie Society and what is their importance?

Kit is the daughter of Elizabeth McKenna and Christian Hellman who was raised by the members of the Guernsey Literary and Potato Peel Pie Society after her mother was imprisoned when she was one year old. Kit spends a lot of time with Juliet, and they become very close. Once Elizabeth's death is revealed, Juliet worries about what will happen to Kit now that she is officially an orphan, and when Juliet decides that she wants to adopt Kit, Amelia offers to help her persuade Mr. Dilwyn. Kit is very headstrong and outspoken. She carries a box filled with mementos from her parents.