Thanks for the advice - "Scooter" is showing improvement each day so far. She is up off of her hocks now - but still uses the backs of her legs a lot instead of just her feet for walking. Hoping that this will fix itself with the aid of shoes and bracing. Also tried the warm water bath (water therapy for chickens? who knew?)

- was not expecting that to go well because I didn't think chickens liked swimming - but she LOVES it and it seems to be helping to strengthen her legs. She is now able to hang out in the same brooder as her hatchmates and keeps up with them well!