Adler began her acting career at the age of four in the play "Broken Hearts" at the Grand Street Theatre on the Lower East Side, as a part of her parents' Independent Yiddish Art Company. She grew up acting alongside her parents, often playing roles of boys and girls. Her work schedule allowed little time for schooling, but when possible, she studied at public schools and New York University. She made her London debut, at the age of 18, as Naomi in "Elisa Ben Avia" with her father's company, in which she appeared for a year before returning to New York. In London, she met her first husband, Englishman Horace Eliashcheff; their brief marriage, however, ended in a divorce.