I shouldn't be doing this but I decided to try looking for the Elizabeth McCue/McCrue who married Isaac Par(r)ish, mar q, 1845, Chester le Street.
Couldn't find a baptism or easily on the 1841 but I've found this family:
Mount, Usworth
HO107/ 299/12/25/15
McCree or McCru (indexed as McCree)
Margt, 44, widow
Elizabeth, 15
Margaret, 13
Sarah, 10
Allan, 6
all b. Co. Durham
If it is the correct family, then Margaret Ann might well have been named for the two mothers - Elizabeth's being Margaret and Isaac's being Ann.
Gadget