Only births I find on Ancestry.ca with Mark Kenny as father and Myrtle Ada Gower as mother is:
Nellie May Kenny, b 14 Sept 1908.
John Bruce, b 24 Jan 1911
Martha Jane, 24 Apr 1913
Martha may just have been spending the night with her grandparents and the enumerator entered her as Gower, not Kenny.
If you can find her mother's obituary it would likely list where all the children were. Also maybe her siblings marriage were written up in the local paper and she may get a mention.