Okay...so today I was lunging my horse in an open field. She was doing good she slipped a few times as usual and bucked and reared and that was that. I continued to trot her around she started to get lazy so I clucked for her to keep up the collected trot and she slipped again this time she bucked and reared then got the lunge line stuck under her back legs and kept rearing, etc. she pulled me and now my right hand if swollen, it felt like she pulled or fractured something but anyways she only bucks/rears when I lunge her. I've seen her slip while under saddle and she dint do anything like that. Whats her problem??