It does sound like she is nervous. You have no idea of what she has been exposed to and how much training she has already had. There is a general training area here on YT. You could look through some of the threads. I'm posting a link to a site called Dog Star Daily. It's done by a veterinarian who is an expert in dog training. There is a lot of good reading there and also a lot of good videos on training. The page I am posting has a multitude of problems that are addressed.
DSD Training Videos | Dog Star Daily