Greetings David
The reference where you read about the "Flying Princess" may have been a book titled
The First Air Campaign, co-authored by Eric and Jane Lawson. There is a short sidebar type of article titled
Flying Princesses: Aviatrices of the First World War. Brief sketches are given of Eugenie Shakhovskaya, Lyubov Golanchikova, Helen Samsonova,and Nadesha Degtereva, all of whom are said to have flown for Russia during WW1. There is also mention of Hélène Dutrieu, said to be the first female Belgian pilot, who began flying in 1910.
I do not know how much credence to place in this article, but it is worth noting that Lyubov Golanchikova is said to have set the world altitude record for women while flying with Anthony Fokker in Germany in 1913. I do recall reading of this event in other sources. Golanchikova was a popular stage actress who is said to have served as a test pilot early in the war, flying a Voisin, before returning to the stage. It is said that she later flew sorties and trained Red pilots for the Training Squadron of the Red Air Fleet during the Civil War. After the Civil War, she emigrated to New York City, and made a living as a taxi driver until her death in 1961. It may be possible to verify a good bit of this account through surviving archives.