If you can use it, which I suppose is another way of saying if you have a student with an interest in her, here is a Cultural Literacy worksheet on Greta Garbo. This is a half-page worksheet with a three-sentence reading and three comprehension questions. A simple, but effective introduction to this famously reclusive woman.
May I presume to recommend a viewing of Ninotchka? I doubt anyone would be sorry he or she watched this fine film.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.