It did not get any worse, however, we did lose her a month later. I am not sure what happened, I went to let them out of the coop and noticed she didn't come out, and she was just gone on her side with her legs out. I think it was a heart attack.
I ended up losing another one from this batch a few months later, again went from healthy to deathly ill overnight, she was still alive but I had her euthanized and necropsied since she was getting worse and suffering. (They did not find any definitive cause of death so marked mareks by default, no test done for it) she had less severe of a gap but also had one
The one in the front of this picture, I Iost two months ago, same as the 2nd she went from healthy to super ill. I tried to give her antibiotics and she died an hour later in a heart attack position. You can see she also had a bit of a gap. It never seemed to bother any of them, they all ate and drank fine.
I still have 1/4 from this batch. She's so sweet but I can tell she is lonely even tho she is with a flock.
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I am not sure what happened, I had this bad of luck with chicks. The batch I raised before them 5/6 are still alive and the one who didn't make it was an unfortunate predator attack.