I know that it isn't easy to do but this bird should be culled - remember you may be making a decision based on your feelings and not on the chicken's - sorry -

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ditto- give it time.Give her some time to recover. It has been a huge trauma. If she doesn't start drinking, use a dropper and drip it into her beak. If you can get electrolytes into her, that would really help. Right now though, she needs to just rest.
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