Palavra nova no meu caderninho de vocabulário: "chit" 
"In another words she is an insipid little chit. Is that what you mean?"  
A palavra "chit" tem o sentido de um voucher, ticket. 
Chit: an official note giving information or showing an amount of money that is owed or has been paid:
a chit for the dry cleaner's
Mas na frase do Henry James o sentido é de "a young and silly girl:"
just a chit of a girl
"Henry James  was born in New York City in the 19th century. As you might have noticed I love literature from this time. Actually he lived in England. He was American but I don't know if he became a citizen of England, if he became British...I have to check that information out"