Mary and her sister Ann married in a double wedding on 7th Nov 1865, Mary to a Thomas Dunkley and Ann to a Thomas Hewins.
The 1881 census lists Mary Dunkley (nee Muston), now 39 and Thomas 43, as a Master Boot Maker with one employee living at Wood Market which is a street about 500 metres long in Lutterworth township. Lutterworth is about 5 miles from Smockington Holllow. They have a daughter with the recurring family name Ada aged 13 working as a general domestic servant, and a son Arthur aged 6. No further history of this family is available at present. The link John and Mary gives most of the information we have about Mary to date.
George Muston, my grandfather mentions his cousin Ada in his letters however Mary, Ann and Joseph all named a daughter Ada so we do not know if he was in contact with this family or not.
It is also worth reading the census page.
No photos are available however the internet has several good sites with history of the Wood Market area of Lutterworth where she lived.
Refer also to the tree.