I put her in a cage, on some hay, and left her out near where most roost at night.  It is a covered area, and usually has a nice breeze, so she is OK.  She is moving around in the cage by pushing with her feet, but still can't stand up.  She is eating and drinking fine, and seems alert....has no symptoms of being sick that I can see.  I'll take some cantalope out to her shortly.  I just feel so sorry for her, and so helpless.  I'm leaning more and more toward an injury of some sort.  She had made a fist with one of her lovely feet yesterday, and I opened her toes back out.  They felt very flaccid...almost rubbery.  I have been gone most of the day, and checked on her the minute I got home.  She had a chicken visitor by the cage.  :0)  I'll go back out with her and check her foot again.  I hate to think she is in pain, but I don't know how I would know if she was.  All the chickens are panting some, because it is so blasted hot outside!  However..with the breeze blowing through the area where they sleep at night (and hang out some during the day), it can be almost comfy out there.  
    I might be repeating myself here.  Yesterday I gave her some oatmeal.  I put her up on the covered top of one of our cages, so I could hold on to her and the others couldn't try to eat her food.  She really went for it, and I could hear a smacking sound...almost as if she was chewing.  I guess it was her beak clicking or something, but it made me so sad I came in the house and cried!  She was trying to enjoy her food, and could be she was in a lot of pain.  I shouldn't be such a softie, but can't help it.  
    Thanks for asking about her.