You can apply to get the Adoption records here:

http://humanservices.alberta.ca/adoption/14846.html
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If she was born in Calgary in 1919- she would be on the 1921 Census- so would her mother Mary

The Voters list- is on the Ancestry- from 1935-1980 so you can search that.

Did you try searching any of the Marys on the 1921 Census that I gave you?
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http://en.wikipedia.org/wiki/Prairie_Bible_Institute

http://www.prairie.edu/contactus

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I would put a posting on the Alberta/ or Three Hills -message Board.

DNA test for your Husband might be an idea- At least he would know his heritage and know if he was Scottish or what ever..

I had a cousin who did this one :
https://www.23andme.com/en-ca/

Ancestry also has DNA test and info on their website

Bye for now
J