hm m . . maybe work on some cavaletti?
and, transitions, more frequently asked for, will keep her seeking to shorten her balance in preperation for a change of gait and speed. Some backing her up, and canter off from a stand still. Work on hills, too. Maybe take some lessons in dressage to experirment with how she will react to more rein contact, and if you are not used to having rein contact yourself, then some lessons on how to do this yourself. basically, eyes on the ground, to wathc and advise.
First you get with the horse, then you get the horse with you.