Martha Staggs 1880 Census Butler Co, KY w John Wesley Allen Family

Does anyone know who Martha Staggs age 9 that was living in the household of John Wesley Allen in Butler Co., KY is?John Wesley Allen was my great-great-grandfather.It says that Martha was born in KY and her parents were born in NC...Also living with them was Sarah, John's wife, Eddie Smith or Smith Eddie age 11, William Turner and Judith Turner.