Hi Michelle
I'm not sure if you've checked the censuses.
The nearest that I can find on the 1841 is:
Pot Ellen, Kildalton, Argyll
Parish 542 ED 6 page 11
Campbell
Niel , 40, baker
Jannet, 45
Niel,15
Ellen, 12
Charles,10
Mary, 8
Donald, 6
Ann, 4
Archd, 2
All born Argyll
Scrap this - see below

No Christina though

Do you have information about them afterwards - marriage, deaths, emmigration, etc.
The family might not have been Church of Scotland so the baptism records might be difficult to find.
Regards
Gadget