Is an avian vet an option for you? She does sound pretty unwell. Lethargy can be a symptom of so many illnesses.Normally she is energetic and very talkative but today she will hardly talk, she is eating and drinking but when I let my girls out to play and forage she just kind of stood there and walked a little and foraged a little but it was all as if she just had no energy. I noticed her tail was down as well and her breathing was not normal. This is all out of no where too. She is on purina duck feed along with oyster shells available whenever she needs.
rats have always been an issue and trying to eliminate rats hasn’t changed in the way we do it, and rat poop is often found in the coops which is why I deep clean everyday and they have never tried eating rat poop before but I can’t really think of any other reason why she’d be acting like this?