Possibly the Mariah Cock in the following census record, but if so, the age is too young. And it would be unusual for a never married woman with no male in the household to have such a steady stream of children. So more likely the Mariah in the record below is a widow:

1870 census of Carroll Co., Virginia, Laurel Fork township, enumerated 2 Sep, lists on p. 49 as family #357/359:
Cock, Mariah, 39, keeping house; Louisa V., 16; James T., 12; Sarah E., 10; Jefferson L., 8; Analiza, 5; Mary C., 2. All born in Virginia.

There is also a Sarah Cock age 18 listed three households above as a housekeeper with the family of John A. (51) and Nancy (50) Marshall, who is probably also a member of this family,