Crop problems, help please.

[azygous]

That's encouraging. I would suggest keeping up with this treatment for another day and see which way it goes. You will know if you need to start the anti-yeast med if she starts to get lethargic and especially if you see her extend her neck and make strange gyrations while gaping her beak. Those are the signs a chicken has an unbearably uncomfortable crop, and yeast can make a chicken extremely miserable.

 

[sampoulton]

Thanks again. She is lethargic but not appearing to be in any discomfort. She is happy to have her crop massaged, to the point of closing her eyes. Despite being from my school, she has spent more time at home with me than at school, due to lockdowns. She hatched on my dining table, so feels at home in the house and around my family. She eats from my hand and drinks from her drinker and also when I drip water from a 1cc syringe onto the side of her beak, she licks away at it.

 

[RoyalChick]

In case it is helpful here is a video of my Minnie with sour crop.
Just as @azygous described, she is miserable trying to clear it. This went on most of the night.

 

[sampoulton]

Thank you for that. She is doing nothing like that, and there is no smell to her breath either, just from her rear end!
Everyone is being so helpful.
I am struggling to find Acidified Copper Sulphate here in the UK but I have added Poultry Drink to her water

I am hoping that the copper sulphate will help too, if it is doughy crop.