I don't think this is hijacking- it's related and quite important. Corporal punishment usually doesn't have long-lasting results.
Hate to hijack the thread, but I have to say something about this.
Yelling (which is what CAPS is related to on the internet) or spraying your dog with water is most likely going to make your dog dislike strangers even more.
Welcome to the wonderful world of chihuahuas, where strangers are a nono, and kids are even worse. Many chihuahuas are easily upset, and something like a spray bottle is probably going to make her associate discomfort with the people, not with the growing/nipping.