In her droppings, the pictures look like she is having yellowish urates, which normally are white. That can be a sign of either a reproductive infection or ascites from liver problems, many times from the reproductive disorder. How does her lower belly look? My sweet little d’ccle, Millie, had ascites when she was almost 11. Her belly turned bluish and was enlarged. I drained yellow fluid from her belly 3 times, but she died within a couple of weeks. During her necropsy, I found about 6 hollow egg shaped globes, probably from internal laying.
The only time I have seen clicking was with a chick who had been bumped and had a leaking air sac on her side. So I think it is a respiratory symptom.