By Volume Two, Elizabeth has dismissed the weasley Mr. Collins and stood up to the haughty Lady Catherine. Her pride had served her well in these cases, but those same traits will also prove be a blind spot. Her personal transformation in attitude, her "pride and prejudice", is still evolving.
In this volume, we begin to understand the valiant nature of Darcy and the wicked persona of Wickham. It will take some time before Elizabeth can begin to see the truth, however. She begins the process in Vol II, Ch 18.
Lydia has disgraced the family and Darcy has tried to save her reputation and that of the entire Bennet family. Elizabeth realizes her error of prejudice and pride. As the family laments the tragedy, "Elizabeth tried to be diverted by them; but all sense of pleasure was lost in shame. She felt anew the justice of Mr. Darcy's objections; and never had she before been so much disposed to pardon his interference in view of his friend."
Though the full ramifications are yet to come in Volume III, both Elizabeth and Darcy are beginning to change their attitudes and opinions of one another.
Eliza Bennett changed her attitude towards Fitzwilliam Darcy way before he intervenes on behalf of Lydia. Recall how she mentions to Jane that she fell for him when she beheld Pemberly? Of course I think she was joking.
When she goes to Pemberly she is brought to the realization that Darcy is a good Master and a good man. Wickham on the other hand is not what she thought. He is an ungrateful dissolute man.
Actually, I believe her transformation begins with the letter that she receives from Darcy after the marraige proposal because she discusses it with Jane. "It appears one has all the goodness and one the appearance of it"
Even before she visits Pemberly she has been thinking differently.