Sick, pale, stooping chicken

Hi, I was wondering if I could get some help with a sick chicken. She is a Pekin bantam and is 5 years old. Lately, she has had her neck feathers up and it’s stooping with her tail feathers down and is slow at walking. She is very pale but still has a large appetite. We have put diatomaceous earth in her food and after that, she passed feces that had white ‘slug’ looking things and had red tinges. Is treating her with diatomaceous earth enough and are there any other things we could do to help her recover?
Thanks so much in advance.
– Myra

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