I would suspect this being her version of a 'stall vice'. You see 'weavers' and 'stall walkers', 'hole diggers' and, of course, 'stall kickers'. Stalling some horses contributes to cribbing, blanket destruction, etc.
I would first consider a 'toy' of some sort to occupy her time or a companion animal first. Is complete turnout, with or without other horses, an impossibility? Is daily work of a challenging and demanding sort out of the question?
Can you put her on a different feeding program that promotes calories from a different source? Sometimes changing up a feeding program can really change a horse's demeanor. I would also add Magnesium (Mg) to her diet. Horses deficient in Mg can be become real basket cases.
Just out of curiosity, how is this horse bred and what is her occupation or future occupation?
As I have stated, she is NOT stalled, she has free roam of the stall in the barn her very large corral is attached to. The very large corral is a good 240x240 foot. Much larger than what most horses have that don't have access to a large pasture or what not. She was in a 48x48 foot corral on a shed row at the last place I moved her from.
She does have two toys she plays with regularly, one a jolly ball(her favorite) and another a large apple.
When she gets turned out to the arena, she is alone, unfortunately. She is boarded with 'show' Arabians and their owners are particular with their horses and such. When she is turned out to the arena she seems to have no interest and just stands at the gate waiting to get out and back to her corral.
As for her feed, she is on Nutrena Empower Balance and mare magic, along with her grass/mix hay fed with a slow feeder hay net. I will definitely look into the (Mg) for sure though! Thanks for that heads up.
She is bred from NRCHA and NRHA and has no occupation as of yet. She is just turning 3 and I am not sure what I want to do with her other than a companion and trail horse. She is coming along very nicely from the training I have put into her already. She is a pleasure to ride when I do ride for the tiny amount of time. And a huge pleasure to be around on the ground. She takes to direction very well and I never feel like I am having to fight her in any way.
These acting out moments are 98% of the time when I am not around or when she is not in my site. I always catch the tail end of the episode from hearing commotion and going to look. I was just lucky the other day when I was leaving to she her temper tantrum from the cab of my truck. The spinning around quickly and ramming her bum into the walls, panels and such while tossing her head angrily with ears pinned and pawing and bucking. She went from a relaxed stand still into this sudden tantrum.
I am really thinking it is coming down to getting her a companion...which is not out of the question but the very last resort.