I'm coming in late on this thread... but it could be a tendon problem (slipped tendons... where the tendons slip off to one side or the other of the hock joint) that is causing her to walk on her hocks and use her wings to move around. Sometimes this is a genetic abnormality, sometimes it can be a vitamin/nutrient deficiency. Usually it shows up in younger birds/keets tho. I'd check her tendons that run over the back sides her hock joints, on both legs... if the tendons look off centered and you can physically move the tendon back to center but it pops right back out of place then it may be too late to do much for her without expensive surgery done by an avian vet. The grooves that the tendons rest in have deteriorated...and she probably won't improve/recover on her own. I have been able to successfully correct the issue in young keets (when caught early) by wrapping the hock joints effectively with a very thin strip of tape (in the opposite direction that the tendons want to slip to) to hold the tendons in place, but have never attempted this or experienced this condition in older birds. You could try tho (do a search here on BYC for Slipped Tendons, it should pull up a couple threads about it), and I would also make sure she gets extra vitamins and calcium and plenty of protein. Most likely the Hen will need to be put down tho... she is undoubtedly in pain already at this point that will only worsen with time, and she will soon develop sores (if she hasn't already) that may become infected and even cannibalized by the other birds... plus she cannot escape predators...