Well, I am sure now that I have the correct family posted above in the 1911 census. I am thinking that Agnes Ritchie Simpson’s mother might have been Janet Simpson …..
Janet Simpson (born 29 Aug 1886) was the daughter of Alexander Simpson and Janet Anderson Penman (married 1874 Leith)
Janet
1st married Robert Page in Leith on 7th April 1911 (just 5 days after the 1911 census)
She then
2nd married Thomas Mitchell in Leith on 24 July 1914.
Then there is a third partner named
George Barnett and Janet died with that surname in Cardiff in 1968.
(There is a tree for Janet on Ancestry which includes a photo. There might be similarities with the photo of her daughter that you posted here?)

Janet Simpson/Page/Mitchell had an older brother named
George Simpson who was born 1882 and died in 1963 Michigan.
His wife was Helen Reid Kerr (married in Leith in 1910) – they had a son named Alexander Russell Simpson, and a daughter named Jeanie.
The family emigrated to USA in 1926.
https://www.familysearch.org/ark:/61903/1:1:ZQWF-JLPZThe 1920 & 1925 valuation rolls for Scotland show George living at
5 Stanwell St, Leith. He is there in 1921 census too.
This is your Agnes R Simpson on her Canada Border Crossing -
emigrating in 1923. Agnes Simpson, age 20, from Leith, going to Portland, Oregon
She gives her “brother” George Simpson as nearest contact-
5 Stanwell Street Leith.
https://www.familysearch.org/ark:/61903/3:1:3QS7-99D9-4RNN?i=1004&cc=2185163&personaUrl=%2Fark%3A%2F61903%2F1%3A1%3AQK3T-FQLHIn reality, George would be her uncle, but she may not have been clear about who were her parents or grandparents. She may have lived with her grandfather, Alexander Simpson, until he died in 1917, and thought he was her father.