Its really great that you know so much about horses, and that maybe someday you will be able to use that.
BUT, you seriously need to go to the barn, work with YOUR horse and YOUR horse alone until you know how to better communicate with others. I don't understand WHY you are working someones horse that hates you. Oh wait yes I do, it gives you a chance to be a know it all and an I told you so person towards this other girl.
This is the kind of stuff that turns people off from boarding at a stable or getting involved in 4H or other horse groups. NO ONE wants to be put down about the way they performed in a show or such things. And if I found out my teenage daughter was saying those types of things online or in person to someone else their horse would be sold so fast and their computer would be out the door.
You are at a PUBLIC facility and there are other adults, kids and families who want to enjoy what they are paying for without childish "barn drama".
Personally, I would not want my girls to be treated in such a manner that it would stick with them the rest of their life and possibly keep them from going to shows or working with their horses because a peer made some nasty remarks about their horse or their riding ability (not everyone has been riding since they could walk).
Gee, now at the bottom of the page I see this is not your first thread regarding "barn drama" and in your first thread you were upset because no one would even reply to YOUR DRAMA.