How has Kit fitted in from the beginning of the story to the end?
In a word, badly.
She was out of place on the ship.
She jumps into the water when she first arrives, giving the wrong impression.
She didn't write ahead, and so surprises her family.
Her clothes are too fine, and so she stands out.
Her habits and manners continually get her into trouble.
Only when she finds "the witch" and Nat does she really fit in.