I recommend shelving the ssc idea.
A more modern forehand is easy enough to learn and will give tons of improvement to her strokes. If she keeps at it and is motivated the ssc might develop naturally from that. Going from an old school forehand and trying to learn ssc is not going to be easy at all. in fact I'd say it would be quite difficult and frustrating.
Working on the semi open stance, swinging across with pronation while keeping the arm and wrist loose will be all you need.
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