In 1901 they're enumerated as Walson living in Caddington:
Isabella Walson head marr 35 b Beccles; May 10 b Beccles, Gerty 8 b Newport Salop; Stuart 7 b Newport, Donald 6 b Luton; Leonard 5 b Luton; Dorothy 1 b Luton; Bessie 8mths b Luton
In 1911 Stewart 17 b Shropshire, Dorothy 11 b Luton and Bessie 10 b Luton were living in Sleaford Lincs where the adult Watsons in the household were Charlotte 49; Helena Marion 37, John 59 and Nicholas 48 - you need to buy credits to get the full details.
If you haven't already got one I think you need a birth cert of one of the children to establish whether or not she really was married eg Stewart Dennehy Watson Newport Salop March 1894 vol 6a page 764. If she wasn't married she certainly got about a lot - Beccles, Newport, Luton, Caddington
David
David