Since she is Chinese be sure she makes it clear that a select well refurbished model is sold to her, the best she can pick. It might even be worth dangling the offer of a gift or such if the phone works properly. Let the seller know you will be opening it up to inspect it too. I have gotten N900s form similar stalls and the hot air and soldering work was terrible with the PCB in terrible shape; the phones only worked for a few days or weeks in both cases.
Since you have more ability to make your expectations known beyond works-on-arrival ebay warranty you might have better results.
Taobao is super cool, have her take pictures, but you need someone like your wife who knows the language, culture, and the object you are buying to negotiate for you, what looks like to many of us as an attitude of ripping off a fool being considered wise business might piss someone off but it is because culture is not universal. If you are specific on your desires you can get everything from complete useless but good looking rubbish to the finest craftsmanship, but you do have to pay for the best, westerners mess this up on a very frequently when chasing 'a deal' and negotiating away quality and even function.
Congratulations!