Our girl Pollo Sapphire Gem Pullet, about 18-20 weeks old, is not feeling well. She's our lead hen, so usually very vocal, very curious, and friendly. Yesterday my wife noticed she was being somewhat lethargic, laying down mostly and not moving around the run when my wife went in there. She noticed her bottom feathers moving in and out like her vent was pulsating. Thought maybe she was set to lay her first egg, but this morning we noticed some weird poop (first picture). Looked like chopped up sausages or grapes, very spongy. My wife took a sample to the vet she used to work with and they did not see coccidia. But we already started a corrid treatment in everyone's water. the vet prescribed my wife some oxytetracycline to treat the water for all the chickens, thought maybe it was a bacterial infection. That was going to start tomorrow. But she didn't get any better today, so this evening we decided to isolate her from the other 4 chickens, put her in our bathtub. Thinking it might be ve.t gleet my wife checked and to me doesn't look crazy bad (second picture). Got her inside and in the tub. Gave her waterer, a bowl of food, a bowl of fruit to get more fluids (hot and humid in middle Tennessee right now). After an hour or so checked on her, noticed watery bloody poop (third picture). Her face color is changing from pale to red. Comb changing slightly, but face around her eyes is changing regularly. At a loss of what to do now, any recommendations or advice would be appreciated.