What does Elizabeth learn about Darcy from the housekeeper at Pemberley?
Elizabeth, previous to her visit to Pemberley, had found Darcy unpleasant, overly proud, snobbish and all around poor company. His first proposal to her does nothing to change this opinion of him and she has no problem telling him about her thoughts about him.
However, when she visits Pemberly with her aunt and uncle when he is not home, she is surprised to learn from the housekeeper that Darcy was the kindest, most wonderful, most generous master that the servants can ask for. This naturally causes Lizzy some internal confusion as it is the exact opposite of what she knows of him.