Could this be them ?
Census 1861 282/02 011/02 024
Dundee Parish, Forfarshire
159 Lawson Close
Ann Flaherty, Head, Married, aged 50, born Ireland
Mary Flaherty, Daughter, Single, aged 25, born Ireland
Margaret Flaherty, Daughter, Single, aged 20, born Ireland
All three are "Mill WQorkers" and no husband shown.