Pride and Prejudice Volume 3, Chapter 2
Darcy brings his sister over to meet Elizabeth not long after Miss Darcy has arrived at Pemberley. Bingley comes over soon after that to say hello. Elizabeth is surprised that Miss Darcy is extremely shy, not proud, as she'd heard. Bingley makes a few quiet and subtle references to Jane, which Elizabeth is happy to hear. Meanwhile the Gardiners have decided that Darcy is in love with Elizabeth, but they can't tell how she feels about him. After the guests leave, Elizabeth realizes that it was a pleasant visit although she's been too nervous to enjoy it. The Gardiners don't press Elizabeth about Darcy, and she's grateful because she's trying to determine how she feels about him. Things have changed so drastically for her where he is concerned. She finds that "[t]he respect created by the conviction of his valuable qualities, though at first unwillingly admitted, had for some time ceased to be repugnant to her feelings; and it was now heightened into somewhat of a friendlier nature, by the testimony so highly in his favour, and bringing forward his disposition in so amiable a light, which [their encounter at Pemberley and his visit to Elizabeth] yesterday had produced." Volume 3, Chapter 2, pg. 181 She thinks that he must truly care about her if he can still be this kind and interested after the way that she'd treated him.
Mr. Gardiner has a fishing date at Pemberley the next morning, so Elizabeth and her aunt decide to return Miss Darcy's call then.