How does the character Kit change in the book The Witch of Blackbird Pond?

Kit changes a great deal over the course of the novel. When readers first meet Kit, she is very much a teenage aristocrat. She is used to having money and fancy dresses and not working. In fact, when she lived with her grandfather, Kit had slaves/servants that attended to her needs. Basically, Kit thought that much of the world revolved her and her needs.  
Once Kit arrives in Connecticut her life is drastically changed, and Kit goes through a rough transition trying to figure out how to fit in.  Eventually, Kit learns to work as hard as other people in her community, and she learns to give of herself to help others. This is best demonstrated in how Kit devotes a great deal of time and energy into teaching Prudence how to read and write. The change in Kit is not a surface level change for survival reasons. Kit is a changed girl by the end of the novel, and that is why the novel ends by giving readers the strong impression that she will stay in the New England area with Nat. 

"That ketch has a mind of her own. She's contrary as a very witch herself. All the way up the river she's been holding back somehow, waiting. Now you’ll both have to wait. I'm not going to disappoint her, Kit. When I take you on board the Witch, it's going to be for keeps."