Miss Bingley was very deeply mortified by Darcy’s marriage; but as she thought it advisable to retain the right of visiting at Pemberley, she dropt all her resentment; was fonder than ever of Georgiana, almost as attentive to Darcy as heretofore, and paid off every arrear of civility to Elizabeth.

– Jane Austen

Pride and Prejudice, Chapter 61. Caroline Bingley, who had set her sights on Darcy, is upset at his marriage to Elizabeth. But she thinks the better of it as she wishes to be able to visit Pemberley in the future. So she continues to be deferential to Darcy, shows more fondness for Georgiana and treats Elizabeth with new-found civility and respect. Caroline is an upper class snob who likes to rub shoulders with people of high rank and status.