Hi Bryan
It does seem to all fit, doesn't it - I'm glad

Seems Isabella wasn't the only one, as her mother Helen appears to have had a child in 1862 when I suspect her husband may have been deceased in 1857:
IGI extracted entry:BIRTH: 11 Feb 1862, Kirkcudbright
Charles DORRANS
Mother: Hellen DORRANS
(Father not named)
Now here's the thing:
Mathew DORAN......
A**ces**Y transcribe him as 15 in 1851, clearly an error - and Scotland's People have him as 45.
If Helen is a widow by 1861 (need to check SP for that), then he died between 1851 and 1861.
There is a death on SP of a Mathew DORRAN in 1857 registered Kirkcudbright age 73.
Thinking it could be his father...and that perhaps his son, Helen's husband died before 1855....BUT
In 1841, the only one I see is:
1841: Marks Mansion St - Kirkcudbright, KirkcudbrightshireMatthew DORAN 50, Agri Sevant, b Ireland
Catherine DORAN 49, b Ireland
and in 1851, the only one I see is Helen's husband.
Perhaps he was really 65 in 1851, not 45 (4 and 6 misread?) or else the Death Index age is incorrect

Cheers
AMBLY