[1] Olga attended the North London Collegiate School, where she was a close friend of Marie Stopes.

[3] At the end of the century the Kapteyn family moved to Zürich, Switzerland, where her mother became the center of a group of reform-minded intellectuals.

[1] There, Olga studied art history, became an avid skier and mountaineer, and in 1909 married the Croatian-Austrian flutist and conductor Iwan Hermann Fröbe, who shared deep interest in aviation and photography with her father.

Iwan had been flutist of the local Tonhalle Orchestra since 1908, but his conducting career took the couple to Braunschweig, Munich and by late 1910 to Berlin.

They had twin daughters in May 1915, but Iwan died shortly after in a plane crash in September 1915 in Fischamend near Vienna.

Among her friends and influences were German poet Ludwig Derleth, psychologist Carl Jung, and Richard Wilhelm, whose translation of the I Ching made it accessible to her.