[I previously wrote]
http://www.pedicab.com/ , or
That would be culturally unacceptable to her.
My wife wouldn't take cultural exception to either powering or riding
one though she grew up where such vehicles are much more common.
In any case, I presumed you would pedal, she would passenger, not
vice versa. There are also side-by-side two-pedaler pedal cars if
more egalitarian appearance is desired.
Actually a tandem might be a solution. Perhaps a 'sociable', side-by-side
model... Some people report that tandems enable their formerly
non-cycling SO's to enjoy cycling. No steering, shifting, etc. if she
didn't mind the stoker position.