Does she get a balanced chicken layer or all flock feed for egg layers or just the wild bird feed above? That is not for hens. Or is that just a treat? She needs a balanced chicken feed with 16-20% protein. Besides the crushed oyster shell I would also recommend a granite poultry grit to be put into a separate container from feed. New pullets can sometimes lay soft shelled eggs in the beginning. The concerning thing is her pale yellow poop. Urates in the droppings are normally white, and yellow ones can be a sign of a reproductive disorder, infection, or liver problems which can lead to water belly. Dehydration also may cause it. I would get her drinking some fluids right up to her beak, dipping her beak for half a second if needed. Something like Poultry NutriDrench 2 ml or some electrolytes with vitamins in the water may be helpful. I would also give her a human calcium tablet with vitamin D about 300-600 mg now, or give a Tums broken in two pieces orally.
