Photographs in the Admiral Digby Museum, Digby, Nova Scotia. One of the bottom ones is of Paul Yates Photography Studio.
Here’s the link for looking up Canadian Census records.
The 1911 Census (Canada) lists an Alvira Dennison living as a “Nurce?” with Howard and Bertha Seeley and five children age seven and under in Yarmouth, Yarmouth, Nova Scotia.
There is a death record for Bertha Ellen Seeley which lists her place of birth as Digby. It lists her parents as Edward VanTassel, born in Digby, and Mary Ameriault, born in Plymton.
There is a marriage record for Bertha Vantassel and Howard Seeley, July 26, 1900 in Digby, Baptist, both 21, both unmarried. It lists his residence and place of birth as Liverpool, NS, and hers as Digby.
It lists her parents as John and Eliza. There is a death record for an Eliza Vantassell, Catholic, residence Marshalltown, from Digby.
This explains where Alva was in 1911, she used the name of Dennison. It does not explain the connection between her step father, Charles VanTassell and the people for whom she was working or living. She was 14 years old at the time of the census in 1911.