Who is Annette Mandeville from Flashman & the Angel of the Lord: From the Flashman Papers, 1858-59 and what is their importance? "Flashman_&_the_Angel_of_the_Lord:_From_the_Flashman_Papers

A fictional character, Mandeville returns from "Flash for Freedom!" where she and husband John own the Greystones cotton plantation in Mississippi. John hires narrator Harry Flashman (under the alias Tom Arnold) as a slave driver. Annette is imperious, spoiled, and petulant; well-shaped, with a sharp chin, tight lips, and cold, disdainful gray eyes. She and Flashy end up in bed together several times before being caught. John sends Flashy off to Alabama as a slave.