Once again, if you need to catch up, start here.
Then read this (the cool post with the CT scan).
And now (drumroll please), your answer.
In this case, I noticed that her upper lungs had fibrosis. Fibrosis in the lungs is a rare and bad disease, but it usually only occurs in the lower lungs. It's generally called interstitial lung disease (ILD). Very few things cause upper lobe fibrosis AND exclude the lung bases. One of them is chronic hypersensitivity pneumonitis (CHP), which is the diagnosis in this case. Congratulations if you got it right.
CHP has a variety of causes. One well known cause is exposure to exotic birds, but it can happen with any birds, actually. It's probably exacerbated by an unclean environment. In this case, her morbid obesity is preventing her from adequately cleaning up after her animals. Unfortunately, even if she sells all the chickens and ducks and moves into a totally clean environment, the damage is done. Hopefully it wouldn't progress any further, but you never know.
Thanks for playing along. FWIW, I have a ton of similar cases. If you're interested, I could probably post one a week.