Great. I am glad to have helped. Just remember to always set yourself and your horse up for success with each exercise. I would also recommend rfdtv or what ever channel is available in your area and get ideas for exercises. But start with a plan. Establish direction, establish a change of direction, move her feet forward backward left and right establishing yourself as a fair and confident Lead mare. Then have fun. Be creative and keep us up to date on your progress.
Just remember to establish that direction first so you can use it to keep her off of you so you are both safe.
Oh, and just an extra point. I do think 20 minutes doing circles is WAY to long. Understand that may be ok for that horse that is ready to be prepared for a show but your girl is green and needs a starting point to build from. As a matter of fact I never let my horse do more than about 5 circles at a time. Changing directions keeps them thinking about you. And the thinking side of her brain is what you want her using. When you get started let me know and I will give you some really good exercises that will be safe for both of you to get you started.