The 1831 census is not generally available and, in any case, offers very little information to us FH'ers!

Just the name of the Head of the household, and how many people were living at that dwelling.
I am puzzled as to how you knew Charlotte was a widow on the 1841 census?
1841 simply shows Name, Male or Female, Age, Occupation, and whether born in county?
No relationship to head of house; no marital status.
So, at Vilner Farm we have:
Howes, Joseph M 35 Farmer Y
Howes, Charlotte F 60 Y
Howes, Mary Ann F 7 Y
Howes, Charlotte F 5 Y