The mare I'm leasing is a jumper and I've been working on her flat a lot. She is 6 this year, and is pretty uneducated on the flat. Her trot is now improving by leaps and bounds, but I have no idea what to do for her canter. On course I think I must unconsciously ride differently, because she is adjustable, and balanced in her turns and lead changes. But when there are no fences she's strung out and flying, and I rock her back onto her haunches and collect her as if she is jumping, but she soon realizes there are no jumps and starts flying (I would think maybe she isn't muscled enough to hold it, but on course she does just fine) and cantering a circle is ridiculous. She completely drops a shoulder and is very unbalanced (she's going around like this "/" instead of like this "|" and I really don't want her to end up like this "_" if that makes any sense)
I try to help her but I'm just not really sure what to do. I try to lift her up with my leg but she thinks any leg at all at the canter means lead change. I feel like her mentality is "trotting and jumping my job is to cooperate and listen, cantering my job is to run" but I'm probably not doing much to help her with it. Also on flat for a lead change she occasionally drop her entire shoulder despite the fact I'm trying to lift her up. I want to improve on this, and I know I'm doing things wrong despite the fact that I've listed all her faults, I just don't know exactly what I'm supposed to be doing but I know what she is. She gets pretty stressed out when she doesn't know what you want or what she should be doing and starts doing tempis, even in a line when you ask her to wait she complies but she's like "uhh... leadchangeleadchangeleadchange"
Are there any exercises I can be doing to help her and me?