Always remember it is the release of pressure that is the reward. We started all our young horses by letting them drag around a lead rope all day for a few days. Use an old one, it will be trash when your done. They may freak out at first but soon they will learn to get themselves out of their dilemma. I see no reason not to use this same method on an older horse. Just let her step on the rope, freak out, then figure her way out of it.
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France