Does she normally lay eggs with hard shells and often? How does her vent look? She probably doesn’t have vent gleet (a fungal infection that causes bare red skin around the vent, and a foul smelling odor, which may cause a continuous leakage of white urates that burn the skin.) Her runny yellow to green droppings might be related to a reproductive infection or disorder. Green poop is usually a result of not eating enough. Is her lower belly below her vent enlarged? Sometimes with water belly they will leak fluids. How does her crop feel—empty and flat, full, squishy or firm? I would offer her some fluids and electrolytes or a bit of Poultry NutriDrench. Mushy wet chicken feed made fresh often and scrambled egg offered up to her beak would be good to tempt eating. Sick hens will frequently take to a nest box. I would keep a close eye on her, and offer fluids every 2 hours.

I'd re-check the crop first thing in the morning before she eats/drinks to make sure it's emptying.
If she's not laid an egg, I'd also give her 300mg Calcium Citrate+D3 for 3-5days, see if she expels any lash material, egg matter.
Check again for lice/mites and consider getting a fecal float on a sample of her poop to see if worms may be part of the problem.
Hopefully she'll improve with hydration and eating, but I do agree, she may have something reproductive going on.