Can you get some photos of the chick/how it hunches and of it's poop?
Corid powder dosage is 1 1/2 tsp per gallon of water. Use at the only source of drinking water for 5-7 days.
I would not add Nutri-Drench or Electrolytes to the Corid water. Corid acts as a Thiamine blocker to starve...
I'm sorry for your loss :hugs
Did the vet clinic do a fecal float on any of the poop? That would have told you if Coccidiosis was part of the problem.
There are several strains of Coccidia and only 2 present with blood in the stool. Going by behavior as well as taking a look at droppings...
It would be good if you can get a look inside her beak if she's getting food stuck. 2 people may be better than one on this. Also if possible, some photos of the inside of the beak. I know...tricky!!
Is she pooping at all? What's that like?
What's her crop feel like?
The hunching is...