Definitely she was one of the most beautiful women ever filmed and dominated film in the early to mid 50s. Of course, she retired after marrying Prince Rainier in 1956. Even up to her death at age 52, her elegant beauty was evident.
She left a wonderful film legacy behind, and the films she made for Hitchco*k (Rear Window, Dial M for Murder and To Catch a Thief) defined the cool blonde heroine. Hitchco*k became obsessed with her image, and his later leading ladies were also blondes (Doris Day, Kim Novak, Eva Marie Saint, etc.).
Hitchco*k tried to convince Grace to make Vertigo and Marnie for him, but she was already Her Serene Highness and retired from films. She kept her promise to Rainier and declined.