Are both Cornish X?
Can you post a photo of their legs/feet?
Did you every feel the abdomen for bloat/swelling?
In the photo both of them look wet? Are you bathing them?
While not walking can be Marek's, sadly with a breed like Cornish X leg deformities, ascites and heart/organ problems should...
I'm sorry to hear about your pullet.
I would not worry about the eating, she does need to stay hydrated. Check her crop first thing in the morning before she has had anything to eat/drink - it should be completely empty or flat.
The wheezing is concerning - it could be Ascites since she is...