Terrific. I would hold off on the corid myself. Hopefully she has some improvement and you will know you are headed in the right direction, be a good time to dose your whole flock. If she does have improvement give her a second dose 7-10 days. After that I'd give her probiotics to settle their bellies.Gave her Valbazen. She is drinking.
If you still have concerns you can give the whole flock corid in their water but do give it a few weeks after her last valbazen dose unless she is going down.
Now, if she looks worse in the morning then I would direct dose her with .2mils corid then add to water with the whole flock for the 3 days. I would stay as far away as I could from mixing the 2 meds but unless you do a fecal float it is a guessing game.
The guess is she has never been de wormed, is 1.5 years old and has some resistance to the parasites in your dirt.



If she does not start eating I would syringe feed her. 10 mils 3x per day minimum. I like to use a protein powder and add vits etc but being you are trying to kill worms I'd hold off on vits for a day or 2. Just make sure she does not starve to death and 30mils is minimum per day is min to get her by.