Hi,
My take on this is that her husband was bounced on & off the throne so many times that perhaps Sophie never had the opportunity to establish herself as "Queen"...
This never happened to Olga; she was seen & revered as "Queen" for 50 years, and was very well established as 'head of the family (rightly or wrongly) even after she was 'Queen Mother'.......
It seems to me that even today Olga is viewed as a queen and Sophie, Elizabeth, Fredericka and even Anne Marie are overlooked!
Larry