She has not had any training, and she is four.
You have had her for four months. You think you are expecting too much, too soon?
Success in training depends completely on you and your attitude. You get out of a dog exactly what you put into that dog.
You do know how to stop.
You take a deep breath, walk away from the dog, and compose yourself. Because if you give her bad vibes, they will be reflected right back at you.