From the artist’s description.
 
The poor mare appeared half dead from the condition of her faded yellow fur. It almost looked like shed been dipped in bleach. Her eyes were completely bloodshot, and she wiped away tears that slowly slid down her face and into her runny nose. Her mane was an absolute mess, something that would give Rarity an aneurysm if she ever saw it. Fluttershys wings looked like they hadnt been preened and she was barely standing, ready to collapse at a moments notice.
 
Fluttershy opened her mouth to speak when her eyes widened and she started to cough again. Applejack made sure she was out of the way as Fluttershy covered her mouth with her hoof, saliva spitting out with each hack. It went on for a good while, longer than most coughing fits Applejack had heard, and she was forced to watch as each cough dragged Fluttershy closer to the ground while Angel patted her back.