My horse, Dreamer is a 12 year old Quarter Horse/ Appaloosa cross. Sometimes she is the best horse ever and does everything I ask her to and sometimes she won't do anything. I mostly just trail ride her around my house and sometimes work in the arena. I have a really good relationship with her on the ground. I do natural horsemanship with her and she responds really well. When I get in the saddle, though, she just puts her ears back and won't do anything I want her to do with out a lot of persuasion. She isn't sore or lame and I don't know if maybe she's just bored or something? Again, she only is like this sometimes, and the other days she is an angel so I don't really know what's causing this. Does anyone have any ideas on helping me with this? Thanks.