Born in Manhattan, New York City, to Greek immigrant parents, she was raised by an overbearing mother who had wanted a son. Maria received her musical education in Greece at age 13 and later established her career in Italy. Forced to deal with the exigencies of 1940s wartime poverty and with near-sightedness that left her nearly blind onstage, she endured struggles and scandal over the course of her career. She notably underwent a mid-career weight loss, which might have contributed to her vocal decline and the premature end of her career.