As Sylvia there is called the name of Sandrine Dumas but it is Sandra Dumas a dutch model in those years. She only made her appearance in Twice a Woman (Twee Vrouwen).
How can you go wrong with two of the best actors around -- Anthony Perkins and Bibi Andersson? Well, add one absolutely horrid actress.
A touching and moving film in the style of Ingmar Bergman. I had a copy on Betamax years ago but that's gone bye the bye!