We have a 1880 census of Lee Co, KY showing Monervy Ross (Age 60). She is listed as the head of household. With her is one daughter (Polly-45) and three grandchildren (Nandy, GD-Age13) (Patsy, GD-Age 9) (James, GS-Age 4)
This may be Herrod's wife & Polly may be Dolly, the oldest daughter.
If this is Our Minerva, why wasn't she with Herrod on the 1870 census?