The Vet seemed to think it was Marek’s disease.
Best way to prevent Mareks Disease is vaccinate on day one or buy birds already vaccinated when purchasing. If had Mareks in flock when had current hens then current ones are probably carriers and can pass on to any new chickens. Probably wouldn’t get any new chickens and keep in same flock at this time. I’m sure the vet has already given you info. on Mareks but can read about it here in the Learning Center and so many other important pieces of raising chickens. Welcome to BYC! Check out the Learning Center:
https://www.backyardchickens.com/articles/
groms did a good job. Is Luna for moon or boss? Being you have an Aulani, I thought I would ask. You look like wonderful chicken parents and I wish you a disease free, best of luck. Glad you are here with us. 