You will find it helpful to read Chapters 35-37 to help you answer this question. These chapters include the letter that Mr. Darcy gives to Lizzie after hearing her reasons for refusing him, and also trace her famous volte-face, or change of heart, that make her see things very differently and also help her to discover how prejudiced she had been.
In particular, Lizzie's self-revelation about her own failings is based on what she discovers about Mr. Wickham and his true background, which of course changes everything and helps her to see events in a new light. Consider how she responds to this news after having thought about it:
"How despicably I have acted!" she cried. "I, who have prided myself on my discernment!--I, who have valued myself on my abilities! who have often disdained the generous candour of my sister, and gratified my vanity in useless of blameable distrust... Had I been in love, I could nto have been more wretchedly blind. But vanity, not love, has been my folly."
Seeing herself in a different way also leads her to reconsider the charges that Mr. Darcy made about her family. Dwelling over the letter and re-reading it again and again causes her to see the justice in Mr. Darcy's remarks about her family:
They were hopeless of remedy. Her father, contented with laughing at them, would never exert himself to restrain the wild giddiness of his youngest daughters; and her mother, with manners so far from right herself, was entiely insensible of the evil.
Lizzie thus comes to see in these three chapters her own pride and prejudice and how greatly it has blinded her, but also the truth about her family is presented and viewed by others.