I'm with some of the others - I don't think that the Mary Ann Doyle who married Henry Mower in 1881 is 'your' Mary Ann Doyle.
The surname Mower fluctuates between Mower/Mawer/Muir which doesn't help things BUT besides Henry William born 14/2/1884, bp.18/3/1884, when Henry/Mary Ann's address given as 6 Ship Street (who appears to have died reg'd as Mawer in Sept.1884) this couple had 2 further children baptised i.e.
Eliza b.19/3/1885, bp.19/4/1885 - birth and baptism as Muir, address 6 Ship Street
Mary Anne b.10/2/1887, bp.12/5/1887 - birth as Mary Ann Moore, baptism as Mary AnneMuir, again address 6 Ship Street.
Unfortunately, family not at this address in 1881 or 1891.
Major point is that this Henry/Mary Ann had 3 children between 1884 and 1887 when they are living at 6 Ship Street when 'your' Mary Ann Doyle - as a single lady - was in and out of workhouse with children who do not include any of the 3 above. Authorities were pretty strict and I'm sure that it would have been known if she had been married to a Henry Mower/variants.
I conclude that 'your' Mary Ann Doyle b.1855 (as was verified) is NOT the one who married this Henry Mower/Muir anyway.
Annette