Sour Crop??

Hi there! One of my hens has been off for the past couple of weeks. All of the symptoms have led me to sour crop: squishy crop, smelly vomit, water spilling out of mouth even when I touched her crop. She's been isolating herself, not moving around very much. Still eating and drinking though! Anyway, I have made her throw up a few times to empty the crop. I have kept her separate from the other girls, have tried apple cider vinegar, oil of oregano, red wine, and vitamin and electrolytes. After a 24 hour fast, I gave yogurt and an egg, Making sure she was still drinking. This has been about 3 days now. She has been pooping, just recently very dark and liquidy! She just doesn't seem to be getting better! Her crop has been feeling empty! What now?! She is getting so skinny! I don't want to lose her! Help!!