"a short letter, note," 1776, short for chitty (1690s), from Mahrati (Hindi) chitthi "letter, note, memorandum," from Sanskrit chitra-s "distinctively marked" (see cheetah).
"small child," 1620s, originally "young of an animal" (late 14c.), of uncertain origin; perhaps a playful deformation of kitten, but The Middle English Compendium compares Old High German kizzin "kid" and Century Dictionary mentions Old English cið "a shoot, sprout, sprig."
she was incensed that this chit of a girl should dare to make a fool of her in front of the class
she's a saucy chit