Hi again Willow,
I keep coming back to that Jane in my searches and she does seem to be only about a mile away from her previous home so, ignoring the birthplace that was presumably provided by the householder who was a bit busy at the time

, it's very plausible.
Just can't fathom out why she should suddenly become a monthly nurse in her 60s, although with 10 children and probably at least twice that many grandchildren, she must have had lots of experience with small babies. [added: most of her own children seemed to have moved to Smethwick since the last census]
I'd be more convinced if I could find a relationship between the families concerned but I'm not having much luck wotking out the Allen family with hubby away. Maybe another one that needs some 1911 census data to work out.
Another interesting snippet about this family is that, if I've got all the matches right, there seem to be three consecutive children who (on different dates) married 3 siblings from another family (called Maull). I've come across two X two before but, is this a record?
S.