A mini Minnie update
It is still dark and I am just back in from my morning coconut oil and massage routine. There really wasn't anything to massage because her crop was completely empty. A situation she is currently remedying by picking the cabbage off her breakfast buffet in the hospital ward.

She was also more feisty than other mornings including being more vocal and getting down off the roost and wandering off before I could grab her (another myth busted that chickens don't see in the dark!).
Her poo overnight however is still mainly liquid. The optimist in me noticed two things: there are definitely urates and they are nice and white, and there is some 'stuff' in the splatter - it is no longer just fully clear water like a few days ago.
How she can have had a big breakfast 3 days in a row - and eaten other things when she forages during the day - and not produce meaningful solids in her poop is a real mystery to me.

The vet called me yesterday and if nothing else good comes from this whole episode I am really happy that I have found a vet who is a chicken lady. She totally got the whole morning coconut oil and massage thing and why it was a delightful way to start the day. She called it 'mutually therapeutic' which is about right!
She also seemed really interested in things like Minnie's mood and is clearly a believer in minimizing her stress by letting her be with her friends and getting exercise. She was very happy that Minnie spent most of the afternoons outdoors with everyone else scratching around.
The poo sample was clear - no parasites, no abnormal bacterial load. The vet is as puzzled as I am about why the poo is not returning to normal and suggested increasing the amount of chicken food mash in my beef, egg, yoghurt, cabbage mix as maybe those will help give her poo more form (assuming she eats it of course).
Thinking ahead to next week when I am away I am thinking of doing a trial without coconut oil and massage over the next 24 hours to see how she does on her own.
It will hopefully reduce my anxiety about leaving her while I am away. Wish her luck!