Hey Michael - I am not well-educated on tiels, and I am sorry to hear of Poppy's problems. I had a thought that seems to be true with all creatures. The digestive tract is often the earliest to show symptoms of anxiety and stress. Are her droppings larger than they were before the addition of the male? Did the droppings change quickly or gradually? Would large droppings indicate constipation? I know with horses (LOL - yes a very large animal for an example, but it is my best comparison!), both anxiety and excitement causes frequent small loose poop, while inactivity and boredom can slow the GI tract and the horse poops in larger, drier piles less frequently than normal. Just a thought from the "poop perspective." (LOL)