Okay. A couple more things. I'm not familiar with that breed but I'm assuming that she's still green broke. Her tenseness and head high in the air is a big part of not being collected and working off her rearend. That should partly correct itself by working with her. Also, a horse with it's head up high is a horse that's alert, looking out for itself and not looking to the rider for leadership. Another thing that will change with working with her.
Yes, during cruise control she should be able to choose where she goes.
When she speeds up, do you maintain your rhythm, or do you match her? Such as if she speeds up her trot, do you post faster or keep your post of where you want her to be? It feels uncomfortable but it's also suppose to feel uncomfortable to her where she'll try to match your pace. If you speed up, that just tells her that it's ok to go that speed.
Christopher, thanks for the information about getting her to turn, that makes a lot of sense and I shall definitely try it. As for the stopping thing, I definitely agree with what you're saying, this is just from my experience with the horse. If I stopped her when she was going too fast (going along the lines with, let me get her to relax, refocus and try again), she didn't seem to get any better. But when I tried to 'ride the speed out' by keeping going until she relaxed and slowed down, she seemed to link relaxing/slowing down with stopping working and started to relax/slow down much quicker. Does that make sense?
The problem was getting her to keep that relaxed pace without having to halt and reward her the whole time.
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That makes perfect sense and should tell you what to do. If you still want to make her circle to slow down and she stays the same pace, make the circle smaller until she slows down. If she speeds up right away when leaving the circle, put her back into a circle again.
Another thing you could try instead of just having her circle, would be stop and back up a good distance. Then immediately go back to the speed you want.
The part about having to halt and reward all the time will get less and less as she learns what she should do.