There are too many passages to choose from for me to illustrate how the omniscient narrator describes Mrs. B, her conversation and actions in a very bad light.

IMO, the dawn of sympathy for Mrs. Bennet has occurred in the intro's to the Jane Austen series on public television describing the society in Jane Austen's day, and an intro to P&P3. P&P3's Mrs. Bennet is shown in a more sympathetic light than Alison Steadman's version in P&P2. The book shows Mrs. Bennet in an awful, so if there is little sympathy, it really kind of starts with the author herself. But it's good to get the balanace and to have some sympathy for Mrs. B. The readership in JA's time might have been more sympathetic despite the bias of the omniscient narrator, being more familiar with the burdens of having only daughters and an estate entailed away from the immediate family.