When the Nazis came to power in Germany, Stöcker fled first to Switzerland and then to England when the Nazis invaded Austria. Stöcker was attending a PEN writers conference in Sweden when war broke out and remained there until the Nazis invaded Norway, at which point she took the Trans-Siberian Railway to Japan and finally ended up in the United States in 1942. She moved into an apartment on Riverside Drive in NYC and died there of cancer in 1943.