It's great that you are now going to be able to do hunters and jumpers! The best thing to do is prepare. Make sure you know the horse really well, and know her strengths and weaknesses. As soon as the course is posted, start to memorize it, and make sure you know it really well. Plan where you can cut corners and shave off seconds, and then stick with the plan. When you get into the arena, remain calm like you do in your hunter courses. Follow your plan, and don't get too caught up in the speed to the point that you have no control. Also , if you notice your horse tripping up after turns or losing balance, make a little bit wider turns. Although, I'm sure with her being a jumper horse she'll be fine! Good luck at the show!