This postcard photograph is dated, March 1910 and was not posted through the mail. The inscription on the reverse reads, "Mary Salmon of Granum we used to know as a young girl. Now of Oregon, U.S.A." The postcard was addressed to "Etta."
Add to this, a second photo of "Mary Salmon, Granum, Alberta," taken Dec 1912, at the Leroy Studio in Portland, Oregon.
I've had a look for Mary Salmon in both the US Federal Censuses, and the Canada Censuses. I'm a bit bewildered that I haven't found a suitable match in either. There are a number of possibilities that require a good deal of guesswork. So instead, I went to the Granum local history book, Leavings By Trail, Granum By Rail where I found a few Salmon references. Only one specifically mentioned Mary Salmon. She appears in the Jumbo Valley Presbyterian Church's Communion list in 1911. I even had a look through some of the issues of the Claresholm Local Press, to see if I could find mention of Mary in the town social column for Granum. Unfortunately, this newspaper begins in 1914, perhaps a bit too late for our purposes.
I would guess by what I've found that Mary left for the US sometime around 1911-1912. I do not know if she went alone, or with her family. If you have any leads on Mary, please feel free to comment below.