She is a young child aged about 4 or 5 in the late 1950s.
Michael is devastated by Mary's death, and screams in torment while cradling her dead body.
She falls in love with her cousin, , 's illegitimate son.
It has been suggested that the situation further damaged Francis Ford Coppola's career and ruined Sofia's before it had even begun.
He fears that Mary could suffer the same fate as his first wife, Apollonia, who was killed by a car bomb intended for him 30 years earlier.
Coppola has said that she never really wanted to act, and only appeared in the film as a favor to her father.