My daughter rides english and is currently jumping 2'6". She has had her current horse for almost a year. She is a 12 year mare draft cross. She frequently has an attitude and sometimes will do a little buck, but for the most part is very good. About a week and half ago my daughter rode her horse and after a lap at trot she started to buck and would not listen. She did this constantly, and much larger buck than she has ever done. We gave her a few days off and tried again and it was the same. Tried a week later and the same. She is not lame/limping, the tack is the same, her back is not tender, and her teeth appear to be ok (but have not had a professional check and had her teeth floated before we got her). The only change is that we moved her to our house since our barn was done, and that was about 3-4 weeks ago. My husband also got the wrong hay this last time, so she had T/A and we usaully give her just timothy. I have a chiropractor coming to check her, but the soonest appoitnment was 2 weeks away. Any idea what could be causing this? Should we not ride her until the chiropractor comes?