Is she (was she) running a fever, or anemic? If a vet isn't practical, I'd consider trying a different antibiotic, perferably a sulfa (got any sulfamethazine/cocci treat? ) It does a lot more than just kill cocci, and it will make sure cocci doesn't become a problem. I'd be thinking a steroidal anti-inflaitory might help too, just the standard ASA or Banamine thin the blood which might cause problems. Just some ideas, it is a tough one to suggest things for, especially when you're already doing what I would. The not eating hay is a concern, can you offer her different hay and keep it fresh in front of her?