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"Jane was therefore obliged to go on horseback, and her mother attended her to the door with many cheerful prognostics of a bad day."
The paradox in the line "cheerful prognostics of a bad day" serves to highlight
Mrs. Bennet's plan that Jane will have to spend the night at Netherfield
Mrs. Bennet's plan that Jane will become ill and have to stay at Netherfield
Mrs. Bennet's plan that Mr. Bingley will have to escort Jane home, allowing for more time together
Mrs. Bennet's desire to punish her eldest daughter
Mrs. Bennet's pessimistic attitude toward the family's situation