what kind of feed do you give her? that may be the problem. I know when I first got my mare the lady had her on 14% sweet feed. It was too much for her and it made her crazy wild. So, my dad recommended that I go to the amish and buy a bag of their grain and mix it with producers 12% feed from tractor supply. It worked for her and she calmed down some, but still needs a calming supplement.