It depends in part on whether she wants to wear something that will look "big" on her wrist, or if she wants something more proportional to her size. For my wife, my 39-42mm watches would wear "big" on her; she prefers smaller watches, so a mid-sized (34-36mm) would work better. A lot of the Seiko 5's appear to be in this size range.
Beyond that, anything is fair game (styles, dial colors, bracelet or strap, etc.). Just remember to post some wrist shots...we're always interested in wrist shots...
If you don't mind vintage, a very simple and slim Poljot De Luxe (or the later Luch version) would look grand too; not big, not loud, very thin, but simple sophistication, like driving an old Mercedes.
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