In 1910 she married a chemist named Dr Krüger, with whom she lived in Moscow from 1912 onwards. She was on holiday in her native Germany in 1914 when the First World War broke out, which made it impossible for her to return. She lost all she owned, and was compelled to start afresh in Germany. From 1920 onwards, Anna Kruger lived in Frankfurt am Main, and in 1927 she joined the class of Max Beckmann at the Stadel Art Institute as a guest. Kruger was two years older than Beckmann, but was soon accepted by her much younger fellow art students such as Georg Heck, Theo Garvé and Friedrich Wilhelm Meyer. She was financially independent, felt no pressure to succeed, and was not interested in competing with fellow artists in their exhibitions. She participated in Beckmann’s classes regularly until 1928, and still occasionally attended his class until 1930/31.