PLEASE, PLEASE read my post again. A lot of you are asking and telling me to do things that I've already covered. I've had horses all my life, and this is the only filly that I've owned that has ever had this issue. I came here to get some input, which I have so far gotten and I really appreciate it!
The hay she is on is very good quality, grown by Oklahoma State University and is fed to their horses in their equine program, if that means anything to you all. I can post more detailed pictures of the hay, but I already know it's good quality.
She has been tube-wormed, checked for parasites, and is on a very strict worming schedule. She isn't wormy.
Ginger gets her hay 24/7. And she is on a ration balancer and black oil sunflower seeds. She also has 24/7 access to salt blocks. When I put her on grain, such as Safechoice, or TC, or Purina, she seems to get skinnier. Odd, isn't it? But, I would like to buy some rice bran to add to her diet as I think that might help. But I just don't know with her.
Here is a picture from today. She seems to look much better to me! But apparently my opinion needs some work...so tell me what you all think! And also, one person said her back is protruding, and it's not. She is kind of slab-sided, and it seems that way in the pictures. I'll take some better full-view pics tomorrow!