Actually DSLD kinda fits with horse in the barn. Wondering if she has a connective tissue disorder with an auto-immune component that is similar but different to DSLD.
Rugbygirl, at 3 she had a foal at side. Not really sure when her posture improved, just know it was fine when she first arrived here. I kind of wonder if it is that she started carrying heavier riders (initial trainer weighed likely about the same as I do), but that is also hard to prove/tell an owner.