There are some great methods to teach your dog to quiet on cue. I've used one on my Chihuahuas. It works great. It's from Jean Donaldson's book, Culture Clash. There are other methods too that are a little easier to do. Google Clicker Solutions. I think there's a good one in there too.
As for the nipping, that too can be remedied without punishment. Give us some more details about what the circumstances are that seem to cause the nipping, who is being nipped, what's going on around her, what kinds of reactions has the dog gotten when she nipped etc.
I don't think anyone meant to be unkind Grammy. The first post just had a "sound" to it...as if it were a joke. I don't know what it was but RTH "felt" it and I did too. So, anyhow....back to the subject: The point is that the dog whisperer is a self proclaimed "expert" and he is not. He has no education in behavior and as far as most trainers today think, he is "old school" when they still thought dogs were trying to dominate us. His methods, his whole philosophy relies on the dog avoiding punishment instead of working to gain reward. It is based on the now disproven theory that dogs are basically tame wolves and are pack animals who operate like wolves. They are not. It has been long established now that coersion, intimidation, force, harshness is not needed to train a dog. And your dog's issues sound very minor. If you have trouble after learning some methods, you could look for a trainer who uses motivation and reward type methods to train. There are a TON of bad side effects that a lot of people don't realize and sometimes don't recognize in the dog when they use of a lot of aversives.