UPDATED - Two month old chicken not walking? Help!

[shellybean40]

 

[GeneGoddess]

Further update:

She is walking normally and is now back in the coop with the rest of the flock. She's getting picked on a bit my the alpha-hen, but not too bad. I expected it. She is also now smaller than my other PR (both are 99% sure female, now that they are 14-15 weeks with small combs). So she's a a bit runt. Her name alternates between Sicko and Michael Moore (no offense to the director). So, no idea what it was and she never developed any other symptoms besides the weakness, but she's now OK. Go figure...

Thanks for all the support!