The best thing for you to do is, get her over the fear of the spray. That is the only and best way to keep unwanted bugs away from the horses. I had a horse that was afraid of the bug spray. We took the bug spray out and filled it with water. I would stand off to the side of her and spray the ground. The minuet she stopped moving, I would pat and give her a treat. Soon she learned and just got closer, then we could spray her with the water. Then we just switched out the water with the fly spray. All fixed.