 By 1908, Peck had designed her first cover for Collier's. Peck began illustrating women's magazines during the 1910s and 1920s, contributing to Cosmopolitan, Good Housekeeping, Ladies Home Journal, Today's Housewife, and Household Magazine. Peck's magazine illustrations appeared in St. Nicholas Magazine, The Century Magazine, The Delineator, the Pictorial Review, and the The Youth's Companion. She contributed several cover illustrations to Theatre Magazine in the early 1920s and worked as a commercial artist on advertising campaigns for companies such as Procter & Gamble, Metropolitan Life, the Aeolian Company, and Ivory Soap. Peck also illustrated educational books, educational certificates, sheet music, fiction, and fairy tales.
