However, it is true that Bronte was far more likely than Austen to use bold and dramatic moments to highlight a character's personal epiphany: a tree being struck by lightening; near death while running away from a confusing situation; a possibly supernatural whisper from a lover; a jump from a roof.
Austen relied on somewhat quieter moments: letters, a face-to-face encounter at a ball; a sister's illness; a fall at Lyme...
I think that too many script writers feel, secretly, that Louisa is in right--that Louisa's impetuous nature is the way to go about things, that Anne must learn to be like Louisa, not the other way around.
But as the 1995 film illustrates, impulse (what Dorothy Sayers in Gaudy Night calls, "The Doctrine of Snatch") is not a terribly good approach to major life events. Louisa's impulsive leap in Lyme is not an anomaly; rather, it is symptomatic of her philosophy: a ME-GET-THIS-NOW id-approach to the world around her.
Both Anne and Mrs. Clay would be more than capable of supporting themselves in the modern world--I see Mrs. Clay as a real estate broker and Anne as the person who cleans out people's houses and appraises their antiques--maybe even a forensic accountant!
However, as members of the early nineteenth century, the two women have limited options. They have to maintain positions which will enable them to snag a man while remaining unsullied and respectable. And this position has its own risks (property becomes the husband's; respectability doesn't automatically entail wealth or security).
From this perspective, Anne's wariness at marrying Captain Wentworth seven years earlier and Mrs. Clay's careful assessment of Mr. Elliot's potential become mirrors to each other.
Captain Wentworth's epiphany at Lyme is (1) he still loves Anne; (2) that however much her restraint in the past upset him, he admires it more than Lydia's impulsiveness.
The following excerpt from Persuadable takes place when Mr. Elliot comes to Camden Place to dine. The incident at Lyme is discussed.
“I never put down the Elliot name!” Mr. Elliot exclaimed in answer to a querulous remark from Sir Walter. “I have ever boasted of being an Elliot.” (What he had said was, “Thank God I’m an Elliot with sense.” And he’d only mocked Sir Walter to his wife’s friends when his Kellynch cousins were mentioned—which was hardly at all.)
Mrs. Clay’s mouth twitched. Will put down his utensils and gazed at her, bringing the others’ attention to her side of the table.
She said, the twitch utterly wiped out, “Of course you did, Mr. Elliot, for who would not be proud of such a connection?!”
He nearly glared at her except Sir Walter had refocused on him, uttering harrumphs of approval.
Returning to the drawing room, Will said pointedly to Elizabeth, “Your sisters will keep you company this winter?”
“Anne is coming soon with Lady Russell. I don’t know if Mary will visit.” Mary was the youngest sister. “There’s been an accident with one of our in-laws.”
“Mary’s husband’s sister, Louisa, had a bad fall,” Mrs. Clay said softly. “She struck her head, and they are still unsure if she will regain her wits.”
“Yes,” Elizabeth said. “Anne wrote something about it. She was there when it happened.”
Will barely managed to restrain his surprise. His wife Sally had been aggravating in the extreme but when her best friend was killed by a racing carriage, Will had held her while she cried. He hadn’t been so awful a husband that he couldn’t sympathize with unexpected terror and pain.
Elizabeth behaved as though Anne had witnessed a minor brawl at a local fair.
For a moment, Will’s eyes met Mrs. Clay’s. A faint wryness touched the corners of her mouth, then she leaned forward solicitously to ask Sir Walter if he was comfortable.
Will broke in: “Where did this accident occur?”
“In Lyme.”
Will had passed through Lyme on his way from Sidmouth. A collection of pretty women and soldierly-looking men had stayed at Will’s inn. No doubt, the unmarried Elliot daughter had been among them.
I should have introduced myself. I might have met the other unmarried daughter—
Will shrugged mentally. Reintroducing himself to anyone in the family but Sir Walter would have gravely offended the man. He must tread carefully, for Mrs. Clay—patting a pillow for Sir Walter, assuring him that a man of his well-maintained posture deserved a bolster—was a more subtle threat than Will had initially anticipated.