In terms of the restriction to the first generation born abroad, yes. In the OP's case, he/she would be a citizen if the birth had been registered, but, because the Canadian parent was a woman, it could not have been registered. However, there was a temporary provision in the 1977 Citizenship Act that was not widely known that allowed the children of Canadian citizen women to apply for a non-retroactive "facilitated grant". See "facilitated grant" here: immigration.ca/en/express-entry-manuals/225-home/immigration-manuals/h-c/2484-retention-of-citizenship-prior-to-attaining-the-age-of-28-years.html