It is difficult to tell what is going on with your pullet, but the bright yellow in the dark green dropping looks abnormal. The white is uric acid kidney waste. Are the small particles in the dropping seeds or bits of her undigested food? Can you try to get some sulfamide antibiotic such as sulfamethazole, sulfadimethoxine, sulfatrim, sulfaquinoxaline? Those can treat for coccidiosis and enteritis, both intestinal diseases. They also can treat for gram negative and some gram positive bacteria. You would need to not eat any future eggs that she lays for at least a month after she is off the antibiotic. We are not vets here, so if you can see one locally, they could test some poop for disease and parasites.