I'm not sure what caused it with this hen but I'm suspecting some long pieces of grass that we threw out to them last weekend. We gave them the grass clippings from the front yard but there were also some 8 in. long pieces of grass that we pulled from the flower beds. I usually cut them up into smaller pieces but I forgot to tell George to do that. Fantene may have already had the fungus/vent gleet and the long grass stuck in her crop may have caused the sour crop. It's just a guess. I am back to giving my whole flock plain yogurt in the AM, fermented feed later on in the day, and ACV in their water.That is great news Debi, I hope she continues on her path to health.
Your original post has caused me to do a lot more reading on vent gleet as well, nasty stuff.