You might want to read this:
https://www.backyardchickens.com/t/...rgency-and-supportive-care-updated-10-30-2016
https://www.backyardchickens.com/t/...rgency-and-supportive-care-updated-10-30-2016
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I think that small amount of garlic are unlikely to cause a problem. Many people give it and see no ill effects doing so.I read it
http://www.the-chicken-chick.com/2012/12/coccidiosis-what-backyard-chicken.html
This is a poo website. Read the warning section after treatment. It says no garlic.
I think she needs to see a vet. As for the oil and/or garlic, I don't know. I suspect she has a serious infection or there is something wrong with her liver.
It looks like she is definetely not lethargic and is still her sarcastic self. I will try to post a video. Eating and drinking, May be able to see vet on mon. Would a regular vet be ok, or would I have to do chicken vet?