flash doesn't act quite the same as ur girl just seems fearful of new people like flash plays on slides with my son lol he runs up a fort and slides with my son lol hes somethingI think it's doubtful he will improve. Poor nerves are often inherited.
I went through this with one of my dogs. She was okay up until about 9 months, then she went into a fear period, and never came out of it. At age 2, she still could not pass a basic temperament test, and when a small puppy came running up to her, she yanked the leash out of my hand and ran away!
She was also scared of men and children, but not due to being abused. It was strictly lack of exposure - there were no children in my household, and she rarely saw my room mate's son, who lived in the basement and was handicapped, so he couldn't do the stairs.
My male is almost 4 and will still submissive pee if he is afraid (or pee from excitement if my husband comes home and he is not in a down stay or crated). He has very weak nerves, and is generally fearful/leaning toward fear aggressive toward people. Have you ever taken your dog to a trainer? I’d work on upping your obedience and engagement level with your dog. And I’d be careful to keep strangers out of his space. He’s showing you he is uncomfortable with strangers, so I would respect that. Take him out and let hom see that strangers are no big deal. They are just part of the background. Work on obedience in places where he can see strangers, but don’t force or allow any meet and greets with strangers. Once he realizes he isn’t being forced into interactions that make him uncomfortable, he may become more confident in general. I’d try to gently expose him to as much as you can, without forcing him or pulling him too far out of his comfort zone. Build his trust (and his confidence) in you. If it is due to genetic weak nerves, the weak nerves will always be there. But you can work on giving him coping mechanisms, for lack of a better term.