If you have some buttermilk or yogurt, you can give some to the sick girl--if she has coccidiosis, it would coat her intestines and soothe them until you get meds. Be sure and treat all of your chickens with the Corid at the same time. This drug will be in the cattle meds section--in either a packet of dry powder or a container of liquid. Don't buy the big container of liquid--it is pricey and you could never use all that.