In her own past behaviour, there was a constant source of vexation and regret; and in the unhappy defects of her family, a subject of yet heavier chagrin.
– Jane Austen
Pride and Prejudice, Chapter 37. Elizabeth is embarrassed by how the Bennet family must appear to the rest of the world and is also regretful of her own past behavior. This is in the aftermath of Darcy’s letter to her.