[Lucy Dog]

If I were to train a dog to bite or in protection, I'd want the dog to have the right stuff upstairs. Strong nerves, high thresholds, confidence, a clear mind.

Any dog with poor nerves can bark. It's the ones that can think before reacting that are the ones that are right for real protection training IMO.

Training a dog that is already fearful of people and with a not so great nerve base is just asking for trouble and a possible lawsuit. You're reinforcing her fear. She barks and you're telling her good girl. Do you really think she's going to be able to tell if the person she's barking at means harm to you? If this were my dog, I'd ditch the protection training all together.

Who is this trainer and what credentials does he have in this kind of training?

At this point, she's still young and probably can be worked with. You want to teach her that people are good. You should want her to ignore and not react to everyone and everything. Build a bond with your dog. Let her feel like you're the one doing the protecting... not the other way around. Do you really want a dog who thinks it's actually a good thing to bark at every single person and strange thing she sees out in public? This is what I mean by building her confidence.