You should be able to get Albert Edwin Kelly's complete military files for both the South African War and The First World War. You may find information in the files that could help in your search. I know that in the Canadian files, there is a lot of information as to pay documents, next of kin, injuries, debarkation, when and where served and sometimes piecing the information together gets you closer to the info that you are really searching.
www.ancestorsonboard.comhas
I. Robinson, b. 1883, female, 1892 Liverpool to Montreal
traveling with
J. Robinson, b. 1857, male
Mary Robinson, b. 1861, female
It is a stretch but someone may have access to the passenger list and be able to give you more information. I checked the National Archives in Ireland for the 1901 census and couldn't find and Isabel or Isabella (common spelling in Northern Ireland) for Isabel born in 1883 or 1884 in living in Antrim.
(I think I found the family above on the Vancouver - lists Joseph age 35, Mary age 31, Ivy (joy) age 9 so I think you can rule out)
I also went to
http://pilot.familysearch.orgto search for a birth for Isabel/Isabella Robinson and there are a few possibilities but the parents aren't listed so that would mean ordering certificates. I tend to try all other sources before ordering certificates especially in Ireland.