Thank you all for taking the time to answer this thread. I have since posting spent many hours working on my horses ground skills using natural horsemanship methods from a variety of trainers, many of which were suggested to me here.
During this time my relationship with my horse, as well as her obedience, relaxation and responsiveness has improved out of sight.
This of course, means that the original reason for posting this thread is now obsolete as we have already proven that my horse can and will improve using natural horsemanship techniques. Of course, I would usually delete the thread at this point, however I do not know how to on this forum. So it remains.
Thank you again for your time in answering my question.