subs. phr. (nursery).A little girl: an endearment, usually little TWO-SHOES (cf. GOODY TWO-SHOES = a kind of fairy god-mother).
1858. G. ELIOT, Mr. Gilfils Love-Story, i. He delighted to tell the young shavers and TWO-SHOES whenever he put pennies into [his pocket] they turned into sugar-plums or gingerbread.