...and Emma herself knows it. Thanks for the nudge to look at this chapter again! It shows how deeply and implicitly Emma values Mr. Knightley from the start.

Did Emma mean to deceive Mr. Knightley or was she simply thrown by her own discomfort at his differing with her so strenuously? For example, just prior to your last quote:

Emma made no answer, and tried to look cheerfully unconcerned, but was really feeling uncomfortable and wanting him very much to be gone. She did not repent what she had done; she still thought herself a better judge of such a point of female right and refinement than he could be; but yet she had a sort of habitual respect for his judgment in general, which made her dislike having it so loudly against her; and to have him sitting just opposite to her in angry state, was very disagreeable.

And then, just after her obviously untruthful disclaimer of matchmaking plans:

Emma remained in a state of vexation too; but there was more indistinctness in the causes of her's, than in his. She did not always feel so absolutely satisfied with herself, so entirely convinced that her opinions were right and her adversary's wrong, as Mr. Knightley. He walked off in more complete self-approbation than he left for her.