Possible Clues:

• She requested 'As Time Goes By'
• To whom Rick said "The Germans wore gray. You wore blue"
• To whom Rick said "We both know you belong with Victor"
• Film character who says 'Play it once, Sam, for old times' sake'
• '___, She-Wolf of the SS' (cult film)
• She'll always have Paris
• Madeleine L'Engle book
• Rick's love in Casablanca
• 'Casablanca' love
• 'The most beautiful woman ever to visit Casablanca'