I understand why you feel the way you do about Elizabeth's comment. It does come off as a bit superior, but I think it's important to remember that this was written in the 1800s and societal norms were much different than they are today. In that context, her comment can be seen as a sign of how she is trying to prove herself to Darcy and stand out from the other women who were courting him. That being said, I do agree with you that Greta Gerwig's adaptation of Little Women did an excellent job of showing how crafty and determined women of that period could be.