Light sensitivity in hen

[gracie02]

My 2 year old RIR has started keeping her eyes closed most all the time. If she does open one eye, she squints, like she is sensitive to the light. I have isolated her and I've given her electrolytes. She's not interested in food. Her poo is heavy on calcification and what looks like bile? Dark forest green goo. Her vent is fine, no runny nose or eyes. She's stopped laying. She just doesn't feel good. Any ideas? She was a hatchery chick.