What exactly are the symptoms. Is she sneezing, wheezing, any nasal/eye discharge, can't stand, what type of feed does she eat, is she eating/drinking, what does the poop look like, what type of meds has she been on, was she wormed and if so what type of wormer, etc.
You may want to isolate her in the mean time so you can observe any symptoms that she may have and also try to encourage her to at least drink so she doesn't get dehydrated.
Hopefully someone with more experience than me will chime in, but if you can post the symptoms that would be helpful.
Scratch doesn't contain all the nutrients she needs. She should have access to some balanced chicken feed. Is she able to walk? How long has she been sick? Has she ever laid eggs? We need more info to see the whole picture. Runny poops could mean coccidiosis. It wouldn't hurt to treat for that with Corid in the water.
Yes she can walk but takes a few steps and just stands there. I just gave her some mealworm and she ate a few. She has been sick for 3-4 days. She has laid eggs in the past but nothing for about a month or so.....nor have any of my other chickens.
I have purchased the Corid. Should I give her an initial dose and if so, how much. I found a dosing formula on the Backyard chicken website for a gallon, but not sure if I should give her her own dose.
@Hholly has given you a good advice and I agree need feed her a balanced chicken food, the fancy scratch should be used as a treat and not as a complete food.
I also agree that she needs liquids.
I apologize if I sounded abrupt or accusatory earlier, because that is definitely not my intent. I usually look to see if an OP has any previous threads about chicken health/injury, etc. Sometimes that may give a clue as to what may be happening with their flock and assist in helping find a solution. When I saw that you had a chicken die within the last 3wks or so, I was concerned that you may have an illness that could possibly be spreading through your flock. I was trying to determine if the hen that is now sick, has the same symptoms that the one that died had.
I do wish you well and hope she improves soon. Please keep us updated.