"I remember, when we first knew her in Hertfordshire, how amazed we all were to find that she was a reputed beauty; and I particularly recollect your saying one night, after they had been dining at Netherfield, ‘She a beauty! – I should as soon call her mother a wit.’ But afterwards she seemed to improve on you, and I believe you thought her rather pretty at one time."
"Yes," replied Darcy, who could contain himself no longer, "but that was only when I first saw her, for it is many months since I have considered her as one of the handsomest women of my acquaintance."
– Jane Austen
Pride and Prejudice, Chapter 45. Caroline knows that Elizabeth has caught Mr. Darcy’s eye. When Elizabeth departs Pemberley, Caroline directs her spite at the woman she sees as her competition for Darcy’s affections. Having already declared that she never saw any beauty in Elizabeth, in this exchange with Darcy Caroline comments that he once thought Elizabeth "rather pretty." Darcy’s response that Elizabeth is "one of the handsomest women" of his acquaintance settles the issue once and for all and stops the Miss "Nasty" Bingley in her tracks. Caroline has lost the battle for Darcy!