If in fact it's cocci, give the corid time to do its job. You should start seeing improvement in about 3 days but continue for 5 days.
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I'm so very sorry to hear about your chicken. She looks like a beautiful girl. I know I'm getting in on this a little late in the game, but I was just wondering if it was at all possible that she could have gotten into something 'off', 'bad' or perhaps even poisonous? I know moldy feed will sometimes throw them off their game for a little bit. And you don't even have to necessarily 'see' the mold, if the spores are there in the food, it can make them quite sick. Just a thought...
Try to get as much water with Corid into her as possible. With coccidiosis there can be slow moving crops. I would hold a little cup of water in front of her to drink as often as possible. You can just give her fluids today, and if the crop is softer tomorrow am, then give her much food, egg, and a bit of plain yogurt.
PM'd you my number.
-Kathy