I understand why you waited as it's easier for vets to diagnose if they can see the animal without it being on anything. I am so very sorry!
I give my adults either hydro hen or ACV water at least once a week, separate from thei main waterer. I don't know but it seems like since I take a...
I can't imagine what else you could do here. Does her poop look normal, as in no worms or blood?
You didn't mention probiotics. That can be ACV (apple cider vinegar 1 tablespoon per gallon), Greek yogurt, Hydro Hen, etc. I would alternate the Nutra Drench with probiotics and bottled water...