One of my black sex link hens has been staying in her nest box for the last few days. She's not laying at all and I noticed that most of the feathers on her underside are missing. There seems to be some redness in the stomach area as well. I've tried the warm water immersion treatment with massage, have been force feeding her cooked oatmeal mixed with some yogurt, and have gotten both electrolytes and olive oil into her. I haven't been able to feel any egg lodged in her. Her crop felt very hard and large to me at one point, although once I fed her it quickly softened. (Does that make sense at all?) It looks as if her cloaca is pulsing, which makes me wonder if she is eggbound, and she often makes little sounds. She does not seem to be noticeably weakening thus far. Any thoughts about what's going on and how I can more effectively help her?