Birth registrations up to 1915 are available through the Ontario Archives on microfilm. Online through Ancestry, they are available up to 1913, with likely the 1914 records becoming available in the not-too-distant future. Also, the 1921 Canadian census is being released in June of this year, so you should be able to find Dorothy there with her parents.
I did find an entry for the death of a Dorothy E. Turton in Ontario, born 1914, died 1989:http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=TU...
Would she have been 8 years older than her husband?