Sudden Acquisitions

Seven years have elapsed since Elizabeth Bennet married Mr Darcy. Mary Bennet is now the sole remaining unmarried Bennet sister, having turned down the proposal of the clerk her original author allotted her in her letters. The acquisition of guidance from her elder sisters' husbands has improved her reasoning to such an extent that Mr Bennet fears he has not produced as many silly daughters as he had originally hoped.
While Mary is now quite resigned to an unmarried future, she would like the chance to do something that will enable her to triumph over her sisters. Events at Pemberley provide an unexpected opportunity. But can Mary take advantage of her sudden change in fortune?