What's wrong with my hen?

[friend of chickens]

I have a hen who brooded, hatched, and raised her young for 6 or so weeks. Last week she laid the first "post brooding" egg, then the next day she seemed like she had eaten something awful, was moving very slowly if at all. I checked her vent and it seemed to be sort of protruding slightly, but the next day it all looked normal again though she hasn't been her regular self or laid any eggs since. I checked her body to see if I could feel any egg that might be stuck--couldn't feel anything abnormal. Now her comb is folded over, and she doesn't seem to eat or drink much. I gave her a warm bath today to see if it would help her (she had poop stuck to the feathers below the vent). I blow-dried her real well. She'll let her "children" climb on her back and snuggle around her, but she pretty much stands around all day in the shade. Is there anything else I can do to help her? Does she need Sulmet? I have some. She was dewormed in Oct. This afternoon, she wouldn't drink and was standing with her mouth open and the gullet going up and down, so i put some water in her feed and she did eat that. Any suggestions or diagnostics? Her poop is greenish and watery, but I'd say fits in the normal range (wide as it is). Would appreciate knowledgeable help, short on time. Thanks so much!