Chickens have white urates in their poop, which is the white cap we see. Do you notice that she has more white urates than usual, or are they yellow in appearance? If she has some stuck to her vent and feathers, it can smell like urine. Is he vent area clean, or does she have any missing feathers or raw area? Can you post any pictures of what the lash egg looked like? Cutting them in two can help with telling if it is an egg or a lash egg. Chickens who have lash egg may have salpingitis, and could have those masses inside the abdomen. It also can be common to have ascites or water belly with some of the reproductive disorders.