Can you go down to the ring you show in and use it when there is nothing going on there? If so, try riding her in it, just for fun, when there is no one else around. Let her loose to run and play. Ride around and don't ask anything from her, just let her relax and enjoy herself. Do this alot and then try a show again. Your first few shows, don't worry about wining,etc... just ride. Hopefully she'll learn from you to have fun too.