Buy her the most expensive bike with the greatest resale value.
That may score you points.
After it sits in the garage for months at a time without being
ridden, or only ridden a few miles, convince her it doesn't
make sense to have such an expensive bike and not ride it
No, that won't work. As long as I have a bike, she MUST have a bike,
even if it is just decorating the garage.
Sell it and buy http://www.pedicab.com/
That would be culturally unacceptable to her.