I couldn't see her filly very well in the video posted by demonwolfmoon, but from what I could see, the filly didn't look in bad shape. The first pic is really aweful but it looks like she is looking/feeling better and was super calm. Op, rice bran is gawd aweful if fed in excess. The hay and nasty water is unpalatable for horses - period. The fresh water will do a world of good, although I suggest you get a much bigger tub. Rinse it out every couple days when it's low, then refill it, of course. It looks like your filly does have access to grass, but I would feed either some alfalfa pellets/cubes or some other roughage if she is penned up all the time with some sort of hay like coastal, Sudan, etc. you do seem to be doing what you can for your horse. She looks better in the video than she did in the pic. I would love to see a video of her fairly close to you, where we can see her body. She looks cute and will be a great horse, given the proper care needed to grow up and be a happy, healthy horse.
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