The BRITTON/BRITTEN name raises some questions. When I first came across it, I though that maybe she had reverted to her maiden name following the death of James. But I am increasingly convinced by the FAVEL suggestion.
We know that James was alive in 1841 but dead by 1851. So Frances must have remarried sometime after 1841 to someone named BRITTON/BRITTEN, who must have died by 1861, since she is widowed on the 1861 census.
Does this make sense?