I wonder if you ever found out any more about Mme Karina? I am interested as I have a signed photograph from her (in Dying Swan costume) and other photographs, she was a visitor to my aunt's family living in London in 1920s. I found the clip of her dancing the Dying Swan by Googling "Mme Karina ballet". Apparently she was a prima ballerina at Covent Garden and also the Royal Danish Ballet. If you're still out there would love to know any more! Julia