Indigo8
I saw her as Ophelia in Hamlet at The Roundhouse many years ago.
She was surprisingly good. Nicol Williamson played Hamlet, he was surprisingly bad.
It is no surprise that Marianne was a good actor. She was always an academic high flyer, a gifted actress and musician, although she didn't actually have much of a voice. Whatever career she followed, she would have made her mark.
Her mother was an actor and dancer, driven out of the profession in Nazi Germany because she was half Jewish.