Stress does stop the shell production,But it resolves itself rather quickly. She might just have faulty plumbing and does not produce enough.
This is a hard call.
I wish someone else who knows more would see this and chime in.
I fortunately have a husband who dispatches our hens in a quick and painless way -for them, I get emotional. But sometimes it is better than letting them suffer. I am very sorry this is happening to you both.
The white in the poo is urea. It does not look like there is any solid waste in it.
https://www.backyardchickens.com/t/948204/watery-white-poo-picture-3-year-old-polish-hen-lethargic-droopy-wings/0_50
And then again... that was the stance our rooster took before he ...um, died. I did not know what it could have been. I am thinking now maybe sour crop. Or, some genetic issue.
It is a shame we can't just ask them what doesn't feel right.
I hope you figure it out, and please tell us when you do.
Does she kind of look like she is walking like a penguin?
It might be internal laying.
Go do a search in the box at the top of this thread, and type in 'internal laying'.
Speckled hen had a girl she worked on for a while with this.
Do you have the oyster shell mixed in with the feed or separate?
I had a few soft or thin shelled eggs and mixed them together for a few months. That seemed to help.
Then I just kept the two close together in the hen house so they won't forget to have some.
I have one hen that just lays thin...
That seems to be up to each individual bird.
I have had a couple hiss and growl, and one actually would bite, but out of 24... that means the other 21 were still sweet.
Broody orpingtons tend to be stubborn about caring for themselves though. You will need to remove them from the nest box and...