blue is just the color of the nose.. has nothing to do with what type of dog you have.. check out the behavior section on the forum or post a new thread.. im sure youll get many helpful tips
It depends on whether is is playing to aggressive or being human aggressive. I would have her looked at by a professional and evaluated for temperament. Human Aggression is not to be tolerated in this breed. This is something that needs to be physically looked at. Growling can be from many things and is a dogs way of communicating so someone needs to actually see her to know the cause of the growling.