Why did she have her horse tied? It sounds like a nightmare to me, I am glad that no one was really hurt, especially Kristy and you.
Was it her own horse? If so, isn't he trained to stand still?
I would be apprehensive about going out again.....
The only time my trainer ever yelled at me was when I thought about tieing a horse up to mount. I got yelled at for just standing there thinking about it:')