I think on the linked website (automatedgenealogy.com) they are indexed in 1911 as 'Groves'.
I think it could be 'Graves', though. From another of your messages it seems like her mother went to BC, and on the BC death indexes there is a Viner Isabel Graves, died in 1957 aged 67 in Beaver Falls, BC.
Her husband was William Frederick Graves, and you can see his WWI attestation papers at the Library and Archives Canada site. He was born in Cambridge, England, but at the time was living in Alberta - Viner is listed as his next of kin.