I'm so sorry for leaving you hanging so long, I didn't realize I never gave a final update. Thank you for caring so much, it means a lot!
I just discovered your post yesterday so, don't trip chocolate chip
1 week ago, today, I had euthanized my 1yr old silkie mama hen from what the vet said looked like "a classic sign of Mareks", and they sent her blood in to UC Davis for testing. I won't find out the results until tomorrow or next week. In the mean time, I have tried reading everything on the terrible disease with little to no hope.
I contacted the lady I purchased her from to let her know, in case she had it in her flock. They informed me that it might have been a deficiency.
So coming across your post was like "maybe there's hope."
I've been trying to mentally prepare for what to do if my flock has Mareks but so hard when you've got some favorites.
I don't entirely regret putting my hen down, with the best intentions and believing what the vet said but, I'm hoping that it wasn't the case.
I'm so glad that your hen made a great turn-around. Definitely think this thread had a lot of valuable advice and information that I have yet to find on the internet.