The day of Lizzy's and Maria's departure, Mr. Collins reminded them that they didn't leave any messages for the ladies at rosings.
"He then handed her in, Maria followed, and the door was on the point of being closed, when he suddenly reminded them, with some consternation, that they had hitherto forgotten to leave any message for the ladies at Rosings.
"But," he added, "you will of course wish to have your humble respects delivered to them, with your grateful thanks for their kindness to you while you have been here."
Elizabeth made no objection; the door was then allowed to be shut, and the carriage drove off."
I may say that Lizzy is not fond of them or she didn't find them agreeable or even she thinks that they don't deserve her humble respects to be delivered to them. But what about Maria who was overwhelmed in them.
Besides, Isn't it be proper if they leave any message to them for Charlotte's sake.