Elizabeth has complete confidence in Jane and knows that she will never be disappointed in her. What a lovely sentiment. They were close as sisters and become even closer; they are good friends as well as being sisters -- an example to all around them, though I suspect that few (if any) appreciate them as such. :-)

I completely agree with your statement here. What I especially like about it is that Mr. Darcy was one of the few who did appreciate the close relationship Elizabeth shared with Jane. In a way, it reminded him of his love for his own dear sister, Georgianna. I'm certain that he was warmed by Lizzy's concern for Jane at Netherfield - he had to be touched by her actions (even though her petticoat was muddied!).