Mabel was born 18 September 1895, in Ontario, possibly Toronto. Her father was Walter Venn Harvey according to the 1901 Toronto, Ontario Census - unsure of her mother's name, but maybe Mary ----. Mabel moved from Toronto to Vancouver, British Columbia with her father's second family in 1912 and at some point around 1916 disappeared. We know she had a son, Bertram, born in Vancouver about that time. He too has disappeared. Family legend says he may have been adopted. Mabel worked as a telephone operator for the BC Telephone Company and Canadian Swift Company in Vancouver for a while. We don't know if she stayed in Canada or went to the United States, possibly Washington state. She was a beautiful young woman according to her pictures. Have been searching for her and Bertram for 30 plus years.
On the SSDI there are 13 Mabels who share Mabel's birthdate but have ruled out all except for those in PA or NY, whom I have not been able to identify. Of course, she may have died before those on the SSDI. I have not been able to find any information on Bertram.