Hi,there, As for fingerprint, I really don't have any idea. What I am curioused is since you are working in China, so i presume that you got work permit and resident visa of China. If you got those things, you can do your wife's visa through Direct Consulte Filing at Beijing, Chendu, Shengyang and GuangZhong. Which will save you a lots of time I mean you may let your wife get her visa in 4 or 5 months, and dealing all things inside of China instead of between China and USA. This is just my point, maybe this is not necesary for your case now. Anyway it's just my idea. Thanks for your time.