When you get her back to the barn what happens? You take the saddle off, rub her down and feed her right? What is that training her to do? go back to the barn!!
Not sure your skill level but the best thing to do is ride her out.. and when you get about 3 miles from the barn, get off, loosen the girth, relax, let her graze, maybe even give her some treats.. then lead her home. Yup. And when you get her home, put her in a stall with the saddle on and NO food and NO buddies. Come back out an hour later and take her out, take the saddle off and rub her down and then feed her and so forth.
The object is to make going away from the barn a reward and returning to the barn not so much fun.
You can vary this with the figure 8's above.. but do those when you get BACK to the barn.. and be sure not to reward her when she does go back. Get the unsaddling, feeding and turn out separated from the return to the barn.
There is something about the outside of a horse that is good for the inside of a man. ~Winston Churchill
) Dinosaur Horse Trainer