Hello, around a year ago I bought a 8 years old 16hh Hanoverian mare which was formerly used for show jumping. She's absolutely worse at it and so her owner decided to sell her to someone to perform another discipline with her. Her owner described her as a very sweet mare that would never refuse anything. And so she didn't, her owner said that she never refused a jump even though she made a pole fall almost every time. Her owner said that she was better in cross-country. As I got her, I immediately fell in love with her. She really was a sweet mare. I bonded with her pretty fast. I started training her on dressage. She's good at it, learned pretty fast. She seems to like it. So, 2 month ago I decided to enter a cross-country competition. I wanted to jump again and since she isn't good at show jumping, I decided to do cross-country - and her owner said that she was better at it. I own another horse that I use for show jumping but I haven't joined any competitions with him since I bought the mare. For the first few minutes in the competition, everything went fine. No problem with the jumps. But then the first water jump appeared and I think she wasn't prepared for it. She jumped the jump like the other ones but she wasn't prepared for he water on the other side. She landed and immediately spooked. She reared. I, completely shocked and absolutely not prepared, fell down. She didn't stopped rearing and bucking around, it kinda was a scary experience, she never did that before. I first wasn't able to get up because of all the water that was splashing around because of her rearing and bucking but as I managed to get up, I grabbed the reins and started to try to calm her down. I was able to calm her down after a little bit. The next day, it started. She even was afraid of the halter I wanted to put on her. I calmed her down again. She's now afraid of almost every sound and everything that comes near to her. Vet said she doesn't have any physical problems. I'm not able to ride her anymore and it's almost impossible to even get her out of her box or the pasture. She's acting like a traumatized, aggressive or abused horse. Is this a sign that she was previously abused or had an accident like that and she got a flash black or that the accident at the competition traumatized her? I don't know what to do anymore. I'm scared, am I losing her?