[1][4] In the 1940s, after beginning her career as a reporter at the Nashville Tennessean and Lebanon Banner, she became a foreign correspondent in Argentina, Brazil, and Mexico for the Chicago Sun and Sun-Times, with her writing widely syndicated through the publication's news service.
[1] Prewett went on to cover Latin America on a freelance basis for a variety of publications, including the Washington Post, Wall Street Journal, Atlantic, New Republic, Herald Tribune, Reader's Digest, Saturday Evening Post, and Washington Times.
[1] After moving to Washington, D.C., in 1966, she spent 18 years producing "The Hemisphere Hotline," a newsletter focusing on inter-American affairs.
[4][6] In the early 1950s, Prewett temporarily left journalism and attempted to establish a farm in the forests of Brazil.
[4][8][9] She was honored for her work by the Brazilian and Guatemalan governments, for her opposition to Juan Perón and Fidel Castro, respectively.