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By the time she was given the role (of Ilsa Lund) in April, Bergman would have accepted a script much worse than Casablanca. She had been stuck in Rochester, New York, where her husband was in medical school, since August, and she despaired of ever making another movie.
She wrote despairing letters to Ruth Roberts from Rochester, New York where her husband Petter Lindstrom, who had been a dentist in Sweden, was preparing to become a neurosurgeon. "I am so fed up with Rochester and Main Street I am ready to cry," she wrote.
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Aljean Harmetz (Round Up the Usual Suspects: The Making of Casablanca--Bogart, Bergman, and World War II)