Here, Elizabeth is willing to turn a blind eye to something she sees as wrong, out of respect for her father's abilities and gratitude for the way he treats her (see ch42 paragraph 2). Our heroine is bought off on a matter of principle. That contrasts with her rejection of Mr Darcy's "These bitter accusations might have been suppressed, had I, with greater policy, concealed my struggles, and flattered you..." (ch34). I suppose some principles are bigger than others, and lead to bitterer accusations.