My 2 year old Buff Chantecler is sick. She became listless rather quickly, has little to no appetite, and has bright green diarrhea (although not a lot, because she doesn't eat). We found she was crawling with mites and have dusted her twice with DE. For 3 days now, we have been bringing her in at night, and keeping her outside, but separate from the other hens during the day. Occasionally, she will eat scrambled egg out of my hand. We syringe fed some yogurt yesterday. Mostly, she just hunkers down and sleeps. She is drinking water with Avia charge. Today, we could not find any mites on her, but she has not really changed. She doesn't seem to get worse or better. I am frustrated because I don't know what to do next. Should I de-worm her just in case? I don't want to randomly start administering drugs without knowing what I am treating. I appreciate any advice!