Lowenfeld followed her sister into the London Royal Free Hospital School of Medicine for Women in Bloomsbury, London. By the outbreak of the First World War, she had passed the minimum requirement to practice medicine, In 1914 she got a job at the Royal Free Hospital followed by a short period at the Hospital for Sick Children, Great Ormond Street.
Lowenfeld followed her sister into the London Royal Free Hospital School of Medicine for Women in Bloomsbury, London. By the outbreak of World War I, she had met the minimum qualifications to practice medicine, In 1914 she secured a position at the Royal Free Hospital followed by a brief stint at the Hospital for Sick Children, Great Ormond Street.