I was wondering if Gaelic had any influence on the spelling. In terms of date, the information I got that it was likely in the 1800's. That's pretty broad, so if I can get more information, I will let you know! I found a lot of photos of Caroline(Helen) so I'm trying to see if I can find any larger family photos.
Templars hall here
There was a Campbeltown Photographic Studio but I don't know when it opened; photography made huge advances from about 1870 onwards. Would they be about 60 in the photo???
Have you any idea where Helen was when she died?