A very young, high-spirited colonel's wife, Mrs. Forster invites Lydia to Brighton after a fast friendship built on shared exuberance.
Mrs. Forster is the very young and recently married wife of Colonel Forster. Within three months she and Lydia Bennet have become intimate through a resemblance in good humour and high spirits. Her invitation for Lydia to accompany her to Brighton turns Lydia's despair over the regiment's departure into triumph.
Elizabeth judges the friendship a poor safeguard for Lydia's character, especially in a bathing-place and military camp where temptation will be greater than at home. Nevertheless, Mrs. Forster leaves Meryton with Lydia at the end of the regiment's stay. Her own intentions are not called malicious; what alarms Elizabeth is her youth, frivolity, and inability to impose the restraint Lydia needs.
She is a very young Englishwoman and a very recently married colonel's wife. Her face, hair, complexion, build, and clothing are not described.
She is Lydia's chosen chaperone and friend for the Brighton visit, offering companionship but little evident discipline.