Stumbling, unsteady hen with tucked tail...?

[Barnyard Buckeye]

I have an 11 month old Colombian Wyandot hen who started limping a bit 2 days ago, it has graduated to an unsteady gait and she tends to tuck her tail under sometimes. She will drop a wing and lose her balance. She mostly just wants to sit around, but does have some get up and go if encouraged. We have separated her because the other hens started chasing her this afternoon. She's eating and drinking and has clear eyes and a bright comb. any suggestions?? Thank you for any help!

 

[Lady of McCamley]

Sadly my first thought at age and symptoms is Marek's. I will link an excellent Marek's article which also shows other diseases which can mimic Marek's.

Hopefully it isn't. If it is, don't panic. Marek's is everywhere, and it is not unusual to lose a bird here and there over the years to it. It doesn't mean the whole flock is done for.

LofMc

https://www.backyardchickens.com/articles/the-great-big-giant-mareks-disease-faq.66077/