Kammala jumla mai zuwa: Knowlden yana da karamin bangare a matsayin Florence Udney a cikin fim din wasan kwaikwayo na tarihi na 1936 "Anthony Adverse", tare da Fredric Maris a cikin rawar da ya taka, da Olivia de Havilland a matsayin matarsa ta farko. An zabi shi a matsayin Mafi Kyawun Hotuna a
9th Academy Awards a shekara mai zuwa. An jefa ta a cikin "Rainbow on the River" (1936), tauraruwar Bobby Breen, daya daga cikin 'yan fina-finai na yara da Knowlden ya taɓa bayyana a ciki. Wani mai bita daga Detroit Free Press ya yaba da rawar da ta taka a matsayin Lucille Layton, yana kiranta "kyakkyawar 'yar wasan kwaikwayo". A cikin fim din wasan kwaikwayo na tarihi na 1938 "Marie Antoinette", ta nuna matsayin gimbiya Marie Thérèse na Faransa, 'yar jigon taken, wanda Norma Shearer ya buga. Ta kuma buga Laurie Martin, James Cagney ta hali ta soyayya sha'awa, kamar yadda wani yaro a cikin "Mala'iku da Dirty Faces" wannan shekara.