You could just put some antiseptic on the foot wound.
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The other chickens were just stepping on her when she was down i was worried leaving her thereI would keep an eye on her. Separating her in a dog crate with food and water, but leaving her with her flock would be best. Hopefully, she has just suffered an injury. She could also have been pecked or injured by another chicken. Keep an eye on the wing. At 3 months an injury would be suspected. But Mareks disease can show up at this age with wing or leg paralysis. The injury seems to be more obvious though.