Martha, unmarried, was with both parents in 1871 (so not married to Henry)
In 1871, Martha (unmarried, 26, born Quarlton) and living with parents at Pelton Fold had Richard (8) and Sarah Jane (5).
In 1881, Martha (36, born Quarlton) was Head at Turton Bottoms. She was unmarried, a Rag Picker at the Paper Mill, but had three children, Richard, Elizabeth Ellen and George (17, 3, & 9 mo). She should be 40, so could be wrong Martha