I need some advice. I have taken on riding a 12yr of Percheron x Hanoverian mare that came from a horse dealer and was promised to be bombproof. Only she wasn't bombproof at all! The first time I sat on her she freaked out. I have been riding her for a few weeks now and she is improving, some. However, she's very reactive. If she sees my hand in her peripheral vision, she bolts, or if my helmet scrapes a branch, she bolts, or a loud motorcycle going by. She doesn't rear nor buck, but panicks, throws her head up and takes off. It is not every time I ride her either. I really think she's scared of me on her back mostly? I'm very calm and quiet with her and she generally will get on with it once she realizes nothing is happening to her. How can I get her to be less reactive to her rider's movement? Would blinders help? I'm trying not to give up on this horse, but am afraid the owner will never be able to ride her bc she is very timid herself. I'm open for any suggestions. I'm sure most will say go back to groundwork, but most of her problems are when I'm on her back. Ulcers?