Unfortunately, I still think she may have Mareks. Tube feeding would be the best bet to keep her nutrition up to see if she will improve or not. Here is some reading about learning to tube feed:
https://www.backyardchickens.com/threads/updated-go-team-tube-feeding.805728/
https://www.backyardchickens.com/th...ng-guide-pictures-under-construction.1064392/
https://www.backyardchickens.com/threads/updated-go-team-tube-feeding.805728/
https://www.backyardchickens.com/th...ng-guide-pictures-under-construction.1064392/