Update: not out of the woods yet, obviously, but was able to get some inside her twice today. Much better. Saw her eat some (yay) and she is improving rather than declining.
Many many thanks, Eggsessive! I think I will name her Eggy, after you. :)
Has a bright, and apparently healthy “room mate”. As they have been together always, I’m guessing non-communicable.
Suspect crop issue. If she’s not eating why is it full?
Currently on a heating pad for warmth.