She didn't have access to food or water all night right?
Can you get a picture of her poop?
I would follow the article for treatment.
If I have a hen that has a fluid filled crop in the morning, then I treat as a Sour Crop. You may not smell a yeasty odor yet because you have caught it early.
Miconazole or Clotrimazole can be used. Give this 2X a day for 7 days, even if she gets better and the crop is normal, it's important to give for the full 7 days.
I do not withhold food or water during waking hours, I let them eat/drink free choice. I also leave them with their flock to move about as they normally would.
Some folks feel like they need to cage their hen so they can monitor closely and if that's what you really feel like you need to do, that's o.k. too.
You've noticed this early on, treat her and see how it goes. A crop can become slow for various reasons.
Try not to be nervous, you've got this
I'm going to tag our own lovely Carol (
@azygous ) to chime in with thoughts, suggestions and support. She's been a tremendous mentor and help, especially with ailing hens with crop problems.
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
