Update and Question...
Being new, and having a vet close by, I took her to the Vet. My poor girl is wasting away (the vet showed me how to check by feeling the breast and leg areas), and she did a coccidiosis stool test.
The good news - they found coccidiosis, but the fact that I'm feeding them medicated crumbles, it is in check, and normal.
The bad news- she most likely has Marek's, but we are not positive, as it presents in many different ways. We are going to watch her, and if she continues to degrade, we will address. Also keeping a close eye on the other chickens.
Questions -
She was one of 9 that came from a breeder, and I don't think they were vaccinated, so...
1- If one has it, will all of them have it, and if they do, will they all come down with this horrific illness?
2- If they do carry the virus, and don't get sick, is it ok to eat the eggs?
3- what can I do to prevent the rest from getting sick?
Signed - Distraught.