Smelly green diarrhea?

[ShellisChicks]

I have a 5 year old barred rock hen with very smelly green diarrhea by her vent. She is eating and drinking normally. Not lethargic, but waddling differently, not running as much. She hasn’t laid an egg in about 3 days now. My other 2 chickens seem normal.

 

[ShellisChicks]

I gave her a bath in epsom salts. She was easy to catch while free ranging, which she normally isn’t. Any advice would be great. I’ve never had a sick chicken before