Welcome to BYC ! Nice birds ! 

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Thank you. I have the medicine! I needed it for my reds when I got them. I have 1 red left after a dog busted through their run and destroyed my flock. The hen that hatched these chicks is wild. She abandoned 3 off the bat and had that little one with her for a month then abandoned her too. So I put them in with my red so she wouldn’t get lonely and to see how she does with new chicks being introduced since we have some more egg layers on the way. So I will give it a try. Now to just catch her is my obstacleHello, Tami, and welcome to BYC!Glad you joined.
The chick has the classic stance of a bird afflicted with coccidiosis. I would treat with a coccidistat like amprolium (active ingredient in Corid) regardless of what the poop looks like. Do it immediately as coccidiosis can kill chicks quickly.
I would directly drench the little one with 1/8 tsp once per day for 7 days in a row along with the normal dosage of 2 Tbsp Corid to 1 gallon water for 7 days then dropping the concentration to 1 Tbsp Corid for another 5-7 days, making sure that the Corid water is all they have to drink. It will not hurt the entire flock to have the Corid water.
When giving her the drench, just drip it along the edge of her beak and let it wick into her beak. She will drink it.
After the treatment is done, I would focus on getting extra nutrition into the runt. Offer her Poultry nutri-drench in wet mashes, scrambled eggs and put probiotics in the water as well. The entire flock would benefit from a probiotic boost of fermented feed.