Sounds frustrating! If it's always in the same spot you are going to have to get rid of that smell from that location because it will keep bringing her back.

We have a new Corgi who sounds like he had a similar initial experience to yours. He doesn't pee or bark much though but is incredibly anxious outdoors, around noises, new people etc. We have tried exercising, rubs, introducing him to new things etc. He has improved a lot in the sense that he doesn't run terrified from new people (just scoots away) and doesn't run terrified from all dogs (is now friendly to small ones) but change is slow. You're likely going to need a professional plan (i.e. from a trainer) and patience.