The first thing I'd do is get radiographs of your horse's feet to check for NPA. If she has negative palmar/plantar angles, it feels like a pulley system on the tendons being pulled too tight. Constant body soreness that doesn't resolve or massage/ chiro adjustments that don't hold are typically due to being NPA. Radiographs will show you what needs to be changed and how much, and your farrier will be able to adjust accordingly.