The concensus from the board (thanks everyone) is
that the problem is mild laminitis. Her feet are not warm and I'm not
finding a digital pulse, but she walks like I did when I had plantar
fasciatis. Movement-wise, she does seem to warm out of it, but I've
never dealt with such a mild case of laminitis before. What little grain I
was giving her is done, and I'll dry lot her as best I can, but even the arena
has some grass in it. She was getting way too fat, anyway.
Thanks again.