In October 1934, she married a Spanish nobleman in Seville, Count Eduardo Alvarez de Cienfuegos, and settled with him in Spain.

The Spanish Civil War (1936–1939) broke out on July 18, 1936, and Anderson covered the struggle for the London Daily Mail, reporting from the Nationalist side.

[6][7] She returned to Spain in 1938, worked for the Falangist Spanish Ministry of Propaganda,[3] and came to the attention of the Reichs-Rundfunk-Gesellschaft, the German state radio, which offered her a post in Berlin in 1940.

[1] In her programs, she heaped praise on Adolf Hitler and ran "exposés" of the "communist domination" of the Roosevelt and Churchill governments.

[citation needed] She was removed from her position as a commentator after material in her March 6, 1942, broadcast was successfully used by U.S. counterpropaganda when she revealed elite Germans were still dining in luxury despite widespread food insecurity in Germany.

[10][11] She then appears to have been inactive until her return to her propaganda work in 1944, when she made a few broadcasts reporting the brutality of the Red Army on the Eastern Front.

[12] On July 26, 1943, Anderson was indicted in absentia by a District of Columbia grand jury on charges of treason, along with Fred W. Kaltenbach, Douglas Chandler, Edward Delaney, Constance Drexel, Robert Henry Best, Max Otto Koischwitz and Ezra Pound.

[14] From a United States Government Office memorandum dated June 14, 1946: It is true that she could be classified as a political commentator, although not a very effective one, but as she apparently stopped her broadcasting activities shortly after our entry into the war it does not appear worthwhile that further efforts be made to develop our case against her, notwithstanding the fact that she was indicted for treason in 1943.