Hi there. Three years ago, I bought a beautiful yearling quarter horse filly. She was started at two years old, and is THE laziest horse EVER! She has no motivation what so ever. This year we decided to start her over jumps. She took it the same as always, no motivation to go. She would just barely clear the jump, and when she decided she was done, she would run right through it. This went on for about 2-3 months. This last month, she made a night and day change. She started bolting after the jump. Never has she bolted to the jump. Its now getting worse, she will rip the reins out of my hands, throw her head between her knees, and start taking taller strides at her canter, and then she just stops and usually I go flying the first time or two, then I get my ballance, and we end up running across the 3 acre field with no control until she gets to a fence and stops. She is still a very lazy horse on the ground, and doing flat work. She has just started bucking now, and I have no idea what to do. I have NO control so circles won't work as she takes the bit in her mouth and just won't respond. We tried half halting before and after the jump, and got nothing. I need MAJOR help!!!