At Find My Past, the address is listed as "Steam Mills near Conderford" (should be Cinderford) and Reg. Dist. is Westbury on Severn, Schedule No. 101, Sub. Dist. East Dean, RG14, piece 15229, Enumeration Dist. 7. I found Mary by not putting in a last name....just Mary..exact, year of birth 1848..exact, born Gloucestershire, living at Gloucestershire. Quite a few Marys came up, including yours. I had seen her possible christening for February 9, 1848....Mary Lloyd...is that your Mary? The last name Hill also looks a little like "Abell"...maybe try that?
Hope this helps! Linda