I just came across your post and I wanted to share the story of my rooster "Spike" who had this exact thing wrong with his legs. It started when he was a few days old and got progressively worse, until he was grown...then the leg was completely backwards. I took him to the vet, and they told me that the only way to correct this is through surgery to place a pin in the hip/leg and keep it straight. But, he says most birds don't make it through surgery. He said that the leg wasn't painful to Spike (which I agree with because he doesn't seem to mind when you move it around). I mainly wanted to make sure that he wasn't in constant pain, because I thought I needed to cull him.
I decided not to cull him, and in fact ordered him some chicken diapers and made him a house pet. The older he got, the better he learned to cope with the leg. He would use the backwards leg for balance and kind of propel off it and hop with the other. The vet told me that he would learn how to use the backwards leg and that he would need special attention, but he would be fine.
I had him for 2 years, until one day I decided to put him in a little chicken coop I had built for just him, to get some fresh air....and dogs broke into the coop and killed him (along with 3 other chickens in another coop).
Anyway....I just thought I would tell you my story with this same situation. I don't know if it was right to let him live that way, but he seemed to be happy, and to be honest he could move as fast as a normal chicken, lol.
Since he couldn't perch like a normal chicken, he decided the back of the recliner was the best place to sleep, maybe because it gave him a way to perch and have somewhere to rest his backwards leg.
Btw, I tried all sorts of splints, everything you can imagine, and nothing helped. The vet told me that this kind of problem couldn't be splinted.
I hope yours will be okay and I wish you luck with her
