Three Rivers History Mystery: Ann Cunningham and Lot 289 on 5th Street, West Point, VA

Ann Cunningham seems to disappear from the record after 1883.  To date, we have not located a will, death certificate or any deeds in the King William County "burned" records showing how her properties were transferred. Given the fact this was a female property owner beginning in 1863 without any mention of her husband or a trustee, why is there no local record of who she was? Did she die in 1883? Move?