"Cevon Cianol" = Cefn Canol, a village that sits directly on the Wales/England border, just to the west of Oswestry
"The Count" is probably Llawnt, near Cefn Canol
On the 1871 census Margaret is living with her parents, Robert and Margaret Williams, and her sister Mary, at Cefn Canol.
Her parents are still there on the 1881 census but Margaret has moved out.
All of the censuses are for Cefn Canol, Shropshire, England. So the family obviously lived on the English side of the border.