 Soon afterwards, Edwardes cast her as Franzi at the Hicks Theatre in the English-language production of "Ein Walzertraum" ("A Waltz Dream", 1908) by Oscar Straus.Although Millar was able to sell the light musical comedy songs composed for her at the Gaiety, Oscar Straus's music was too demanding for her small voice, and she was sent to New York to star in the Broadway production of "The Girls of Gottenberg".After she returned to London, some of Millar's biggest successes were still in front of her.