Nobody has mentioned The Proposal yet, but it's fairly clear already that Elizabeth's dislike of Darcy does *not* vanish once she knows that he is "in her power". IMO Charlotte does know Elizabeth somewhat better than E. knows her, but not as well as she thinks. I get the impression that though she knows Elizabeth has these idealistic scruples about marriage, she figures this is just youth and immaturity talking, and when Elizabeth "matures", she will come to share Charlotte's "realistic" views.