I found that Mrs. Bennet is better than Lady Catherine in this scene, even if she babbles about Lydia and Jane.

"You have a very small park here," returned Lady Catherine, after a short silence.

"It is nothing in comparison of Rosings, my lady, I dare say; but, I assure you, it is much larger than Sir William Lucas's."

"This must be a most inconvenient sitting room for the evening in summer: the windows are full west."

Mrs. Bennet assured her that they never sat there after dinner, and then added --

"May I take the liberty of asking your ladyship whether you left Mr. and Mrs. Collins well."

"Yes, very well. I saw them the night before last."

I wouldn't have imagined Mrs. Bennet accepting the criticism to her house so civilly, even to a Lady Catherine. Then

Mrs. Bennet, with great civility, begged her ladyship to take some refreshment; but Lady Catherine very resolutely, and not very politely, declined eating anything;

That's Mrs. Bennet 3, Lady Catherine 0.

BTW, maybe the true reason why L C came to Longbourn, is that she wants to assess the house, to give Mr. Collins some suggestions on how to improve it. ;)

As they passed through the hall, Lady Catherine opened the doors into the dining-parlour and drawing-room, and pronouncing them, after a short survey, to be decent looking rooms, walked on.