In my experience, you never worm a sick, and weak chicken, it is a strain on their already weak system. I honestly believe you have a fungus issue in the crop, and digestive tract. You really need to do the copper sulfate thing, but it may be too late, you need to catch this stuff before the bird gets too weak. I hope you get her fixed up, but if she won't drink, and doesn't want to move, she probably won't make it, and you might want to consider putting her down. Either way, you need to keep her away from your other birds, just in case. Good luck, and wish I could do more for you, I know it's hard to watch.