Does she still stand up though?
I wonder since she's a little better if she misses her flock mates. Could you try putting her out with one of your calmer hens in a pen separate from everyone else for an hour or two? Maybe some scrambled eggs would be a good treat too for them both. Then you could gauge how she's doing if she were out there with them fulltime.
If she does well, she still might need to be brought in each night, and let the other one sleep in her coop. Up to you how you try this but sometimes when they've been separated, they make huge improvements being back with their flock. I just think it's too dangerous to put her with her whole flock until she's walking around as otherwise they could hurt her accidentally.
If she's still not improving much though, I'd make a thread in the Emergency forum so other helpers would see this who might have more ideas for you.
