Helen Smith who shows with Jane in 1851 was her daughter

Helen married a James Michael (his mother was also a MILNE

) in 1866 in Old Deer. Her (reputed) father shows as James BARRACK, a farmer - mother Jane Smith. Witness....James Simpson

There is a submitted entry under the name of Barrack on IGI for Helen.
This looks to be Jane staying with Helen and family in 1881:
Jane Matthew 66, mother in law, Stocking Knitter, b Fyvie
James Michael 66, Crofter Of 20 Ac. Arable, b. Old Deer
Helen Michael 33, wife, b. Fyvie
Annie Michael 12
Jane Michael 10
Helen Michael 6
Bella Michael 3
Ferguson Michael 9 Months,
James Wilson 39, newphew, joiner, b New Deer
Address: Kirkhill, Old Deer
Monica