Sorry for the late update, I was waiting a bit to make sure I could give an accurate one.
Outstanding news; She pulled out of it just fine! I can't tell what it was, but I'm glad to say it wasn't merek's. Her legs were never keeping her from walking; it was some neurological damaged she received from a still-unknown source. She is still recovering, but she walk without stumbling at all now: a complete 180 from how she was before. She can do pretty much everything normally now, though I need to reintroduce her to the flock slowly. I'll keep her on some more antibiotics and vitamins as she recovers. Thank you for all the feedback!