Originally Posted by WSArabians
I think the best thing to do would be to sit her down and let her know that Lily is still your horse, and while you have no problems being used correctly in the lesson program, there needs to be some sort of structure or schedule so you can also enjoy your own horse. I would also tell her that you do not feel comfortable with minors catching her in the pasture in case of potential injury and lawsuit. That usually makes them think twice, especially if they don't have proper insurance.
Which is why I would be on that like flies on poo. I personally LIKE my home, horses, vehicles, and in general, my life. I have no desire to give it to someone else who had an accident with my horse, especially one I had no control over, like lessons that may happen when I am not even around.