Found death for a Robert John Gower, died Vancouver 30 Jan 1968, aged 76. His obituary may have details of relatives.
The age is about right for your Gower.
Didn't find anything on a Martha Jane Gower/Kenny/Kinney. Looked under all names on BC Archives site and also Manitoba site.
Marriages in Ontario are only released to 1929 and deaths to 1939.
1921 census was the last one released.
If she was raised by her grandparents, perhaps their obits may have a reference to her.
Grandmother, Margaret, died 25 Dec 1935. No record on Ancestry re grandfather's death.
Don't know if school records would still be around now from Martha's time period. They always lived in Stephen Tsp.