This is clearly an initial situation because there's way too much instability in this system. Pushy mother? Poor, single daughters? One rich, single man? Anyone else predict that the pushy mother is going to be pushing her daughters on the single man?
An obstacle in the path of true love and familial happiness! Yes, this is conflict. To make matters worse, Darcy has developed a crush on Jane's sister Elizabeth, and all the objections he has to Bingley marrying Jane (her lower class, crazy family) also apply to the prospect of him marrying Elizabeth.
Tough. Our lovers seem as far away from each other as possible: Bingley's sisters effectively quarantine him from seeing Jane, and Wickham drips (figuratively) poison into Elizabeth's ear about Darcy's character. While before Elizabeth simply disliked him, she now feels full-on disgust.
All the festering feelings come to a head here. Darcy finally tells Elizabeth how he feels, saying he can repress his emotions no longer, and Elizabeth counters with a, "if you were the last man alive, I still wouldn't marry you." OK, those weren't her exact words, but they were pretty close. She finally vents all her anger over what Mr. Darcy has done to Jane and to Mr. Wickham.
But! That's not the end of the climax! Darcy gives Elizabeth a letter that exonerates him from all the charges she leveled against him. Both characters question their identities. As for Elizabeth, who prides herself on being a great judge of character, she learns that people's exterior masks can fool her. This is the climax of the novel because the greatest attitude shifts come here. It's all smoother sailing from here on out for our two main characters.
If Lydia goes off with Wickham to "live in sin," it will destroy any chance at happiness for Elizabeth and Jane. No respectable man will marry a woman who has a fallen sister. Don't know about you, but we're biting our nails.
Mr. Darcy uses money to force Wickham to marry Lydia. The Bennet family is saved. Whew. Here's the ending we've been waiting for – couples reunited, misunderstandings cleared up, in-laws chucked out the window…
Our two favorite married couples are doing well, but Lydia and Wickham's marriage unravels and they become broke. Charles and Jane Bingley move out of Netherfield after a year because they can't stand Mrs. Bennet, Mary becomes less sanctimonious, and Kitty blossoms under the guidance of her two oldest sisters. Oh, right. Jane moves to an estate practically next door to Pemberley. That all sounds quite peachy.