Who is Jensy Custis from Confessions of a Failed Southern Lady and what is their importance?

Jensy Custis is a black woman who worked for Granny in Ballston and when Granny moves to Washington D. C., she hires Jensy to clean Mama's apartment once a week. Jensy and Granny teach Florence to become a lady with lessons about caring for her belongings and visiting sick people. When Mrs. Dabney dies and leaves her house on 14th Street to Granny, Granny insists Jensy live with them in the maid's apartment in the basement. Granny and Jensy are close friends and always agree on things, such as the proper behavior in given situations. One Sunday night shortly after Florence returns home from the University of Mississippi, Jensy dies in the basement, causing Granny to grieve greatly. Her funeral service is beautiful, and Herb eulogizes her and her status as a lady. Due to her grief at losing her friend, Granny decides to sell the house on 14th Street and move back to Ballston.