I would take her most recent rads as compelling reason, if you’re saying your horse’s hocks have changes.
I hate hind shoes on most horses, but I’ve found it can really make a difference in horses that seem to have some very minor issues. I was surprised a few years ago in the major difference in one of my TBs’ ways of going. I had only put hind shoes on him because we went through a horrible dry spell and the ground was so hard that his hinds were chipping… turns out he must have been underperforming for years because he moved completely different with hind shoes on.
That really changed the way I started looking at horses and their hind feet. I think a lot of them are just fine barefoot but if in work, could really use the extra protection. A lot of them won’t give 110% behind because their soles or walls are sore, it can become more obvious in collection work but in a horse that is just putzing around or in light work I can see how it can be overlooked.
I would think a horse that has some issues behind would benefit, in general, from hind shoes - partially because I’ve met many horses who are barefoot behind and their tenderness behind is never as obvious as tenderness up front is, so a lot of them have chronically sore hind feet, underperform in subtle ways, and protect themselves in such a way that it compounds their issues behind.