It will take a long time for her to calm down, but she's likely anticipating your next aid. Make sure you have solid in your aids, no conflicting/confusing signals, make sure you are using your seat and not relying on your hands, and focus on exercises that require "Go". Focus that energy on lateral movements, and work at the trot and the canter. Bring her down to a halt, but don't make her stand for an extended amount of time. Halt, wait a moment, and then go again.
Unfortunately, it's just the nature of the high spirited ones, but work with what you have. Don't ask her to do slow activity when she's fresh, wait until you've burned off some energy. When you're done with work, walk her around on a loose rein so she understands that it's relaxing time. Eventually, she will completely understand that loose rein means relaxing, and it will be easier to have quiet walks.
Calming a horse takes weeks, if not months, of consistent, slow work. For starters, allow at least 20 minutes of just walking. No trotting, no backing up; simply walking. Too many rides throw themselves on and go causing horses to be and feel rushed or fast. I think that is usually a good place to start! Hope that helps!