she seems to be having trouble getting him to paying attention to her weather its under saddle on a lead or lunging. When prince (the horse) sees a new horse enter the ring he will automatically start to do whatever that horse dose. My MIL gets frustrated and usually brings him back to his stall. I know that prince is just testing her to see how much he can get away with, I explain that to her and she dosnt get it.
This is where those exercises I told you about will really come in handy. It just takes patience and persistance!