Originally Posted by My2Geldings
Are you currently working with a trainer? I would be going back to basics and working on transitions and your half halt. Adding poles to get proper distances will also allow her to balance herself which will slow her down. Adding a halt straight ahead after the last fence is also a great way to teach her to fine tune herself on your aids.
I would suggest taking a few lessons with a coach even if its on a different horse to give you more experience.
I am working with a trainer, and I've been riding for quite a long time. Her previous owner didn't train her for it, she just threw some high fences and smacked her over them.