When they get this sick, the digestive system can start to shut down. She needs water more than anything. Try the corid tomorrow (or now if you have some). You can find it at the feed store. If coccidiosis is the problem, she will start getting better very quickly.
If she has another problem, and you force feed her, it may hurt more than help. Diagnosing the problem first is important.
Research egg yolk peritonitis and see if you can rule it out as a problem.
Research egg binding to see if it might be that. If you think so, try the calcium glutonate.
Also, if you can post same pictures of her, it might help. Especially showing how she is standing. Can you tell if her legs look spread apart? Is she particularly heavy?