Pineapple chicken!! As in for the chicken, not a cooking recipe...gosh, humans.
Clear signs of not being well for about three days: sluggish, tail down, feathers puffed up, enlarged crop that didn't empty over night. Didn't appear to be sour crop, no hard crop content. Not bird flu either.
Got a fresh pineapple and made juice to get the active enzymes. The sick bird had some, and after two days of juice twice a day, she was pretty much back to normal.