Oh no! Your poor wife!

I've had numb parts for several days (5 or so, nothing like 3 weeks) and better padding, positioning (if I recall correctly we tilted the saddle down a bit, but that was before I decided I didn't want to be one of those girls who has to constantly defer to her bf in bike-related matters, so don't quote me) and a new saddle (which I may still switch again) all played a role for me.