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Born in Rome, Dionisio made her debut in the world of cinema when she was only 14 years old., in the movie Darling. Her career followed with parts in mediocre musical Italian movies, along with singers like Mario Tessuto, Gianni Dei, Little Tony and Mal. On the set of one of these movies she met director Ruggero Deodato, who became her husband. The two had a son, Saverio Deodato-Dionisio, who worked as an actor.
In 1975 Dionisio was protagonist of Ondata di piacere, the sole truly erotic movie of her career, directed by Deodato. In the same year, she played Ugo Tognazzi's lover in the comedy Amici miei, by Mario Monicelli. In late 1970s she played in several action or sexy movies, but in the early 1980s left the cinema.