Great idea on the myofacial massage therapist, I hadn't thought about that
The Back on Track stuff really does do what it claims. I was also a skeptic but I read up on the products on a hunter/jumper forum. Many of those folks are blessed to have very large incomes and will spend the money to try new products for their horses.
Believe me, if those folks do or do not like something, they will tell the world in a skinny minute
I never heard a bad review about the BOT products so I bought the hock wraps for my horse that is like your Lizzi, the Quick Wraps and therapeutic pad for the horse with the injured sacrum, and the dog sheet for my Dobe/Rott with arthritis from an old pelvic fracture.
Everything works better than my expectations were.
A few months back, I saw my 25 yo, with Lizzi's issues, canter for the first time in a few years. He only cantered a couple hundred feet but he cantered; I never thought I'd see that again.
The secret to success is the ceramic particles inside one layer of each product. It causes the body to re-generate it's own heat and the pads hold the heat in.
Sort of like a battery-operated heating pad but the horse's own heat is the battery
I've never seen anything work as good as these products but again, there are certain types of muscle issues they may not be as successful with.
It sounds as if Lizzi might have hock arthritis? If you can afford them, I would invest in the hock wraps.
The quick and cheap fix on her hips would be to buy a cheap heating pad at WalMart and hook it up to her but you'd have to stay with her the entire time. You could hook her up first thing when you get to the barn, do all your chores, brush her, and whatever else, then un-hook her before you leave.
It looks like you probably have electric? Otherwise I would go on the hunt for a battery-operated heating pad -- maybe an RX store that carries a lot of geriatric products for seniors
You would also have to duct tape the heating pad to her hip since I'm pretty sure the soreness is located in her glutes part way down from the top of her back. If you can run your hand down her hip and feel any sort of tightness or lumps, that's the target area to securely tape the heating pad. Start if on low heat and watch Lizzi's comfort zone reaction before increasing the heat