Thanks guys...I culled her last night and dropped her off at an Animal Testing Lab this morning. Luckily it's free in Maryland. It will be a few days before I know for sure if it was Marek's or not. Thanks for the support guys, I will keep you updated.
I noticed 3 days ago that one of my pullets was favoring a leg, she'd still get around and eat and all that, but as of yesterday she couldn't walk at all. She also stopped eating.
I took her to a vet today, and he gave her a quick examination, said that she didn't have any broken legs, and...