.. went back and looked at the pictures again when you mentioned the "displaced hip" , if you noticed
in all three pics she is not putting ANY WEIGHT on her right hind....none

in pic 2 she looks like she is in a tremendous amount of pain. I do not think this is a "displaced hip" which makes
no sense anyway. I would say broken pelvis? broken stifle perhaps? I would consider severe OCD
except for her being and arab/mustang cross while not impossible, moreso unlikely than an injury of some
sort. and she apparently is not improving.
My guess would be she can not walk around to get enough to eat, and if she is in a lot of pain she
just mopes and does not want to eat.

my heart breaks for this mare and I wish I could "talk" to her owners.