OK, well I still don't know what happened to Robert, but here's a story for you...
1871
RG10/4924/13/20
Southgate St., Bishop Auckland
Elizabeth Laws, Head, Widow, 29, Shopkeeper, b. Barnard Castle Durham
Mary Laws, Daur, 6, b. Bishop Auckland
Margaret Laws, Daur, 4, b. Bishop Auckland
Wm. Clarkson, Boarder, 33, Labourer, b. London
Sarah Clarkson, Boarder's Wife, 37, b. Selby Yorks
1881
RG11/4914/76/37
7 Carrs Place, Bishop Auckland
Elizabeth Laws, Head, Widow, 39, no occupation given, b. Barnard Castle
Margaret Laws, Daur, 14, Scholar, b. Bishop Auckland
John McGuire, Lodger, 45, Puddler, b. Ireland
William McA??, Lodger, 41, Tobacco Spinner, b. Scotland
Also 1881
Mary Todd Laws, age 17, b. Bishop Auckland, servant in Wolsingham
1891
7 Carrs Place, Bishop Auckland (same address as 1881)
George Brown, Head, 62, Coke Drawer, b. Newsham Yorks
Elizabeth Brown, Wife, 49, b. Barnard Castle
George A. Brown Son, 4, b. Bishop Auckland
Can't find Elizabeth or George on 1901, but there are several deaths in the Auckland District in the 1890s that could be them.
(BTW, George Brown is in the 1881 with his wife and daughters living in Pollards Land)
So...I have no idea why Elizabeth started calling herself Laws. I can't find any evidence of another marriage, and she seems to have married George Brown as a Todd. But there are enough other details that match up to convince me that this is her.
What do you think?
MJP