If the horse can't trot without injuring itself, it is not collected and should not be performing lateral work or flying changes.
First of all I would focus on the walk (if she has a good one - the second she goes lateral then stop working on the walk) and get her balanced and taking a good stride. We don't want her to shorten the stride, we want her to make it in a different way by engaging her hind end, picking up her front end and moving correctly in 4 beats. The exuberant movement needs to be put in the back closet for a few years until she is truly collected.
Then work on trot and walk, doing a million transitions and always focusing on the hind end engagement and not letting her use her neck to move and balance - instead balancing from behind. We want again, a normal trot. Don't let her passage around, focus on correct non-exuberant movement.
Slowly add in canter and continue with transitions. Again, normal canter.
It i great that she has the talent for all these wonderful things, but right now you must focus on the basics and solidify them before you start putting tricks on the horse. Anyone can teach a trick horse, but it takes years of patience to train a dressage horse. Good luck (: