8 month old chicken limping with tail down.

[bobmcafferty]

I've checked for scaly leg mites/bumblefoot, and there doesn't seem to be an issue. I thought she could be egg-bound but she has already laid an egg for today. She still ate and drank like normal today. Could it be a B-12/calcium deficiency?

 

[CoopintheWoods]

I could be some kind of deficiency, but I wouldn't jump right to that if your other birds are fine.
I'm certainly not a vet, but if she was still otherwise acting normally besides the limp I'd try giving her 1/2 of a baby aspirin daily for a few days. If it's minor, it should fix itself, and if not, you can start thinking about deficiencies and all.

Best wishes!