My 3 yr old Golden Star, a reliable layer, has developed a large swelling under the vent closer to her legs. She is walking, but looks like she has a loaded diaper on. I thought she might be egg bound so I soaked her in a warm bath and stuck my finger up the vent quite far without ever feeling an egg. The swelling is soft and I have massaged it, but it was larger today. She is eating and drinking and does not appear in pain. Can they develop internal egg laying later in life or does that start early on? This all started yesterday.