I am guessing that she has gotten a leg dislocated with the tendon over stretched because of the rooster mounting her. I have a hen right now that had the same problem. She was torn by a spur, so I put a chicken saddle on her. In her case she thought it meant to be submissive. There are two roosters in that pen and being on queue they bred her until her legs gave out. I have her in a large hospital pen in hopes she gets back on her feet and her wounds heal as well.
I've seen this happen more than one time. Especially on a smaller bird with a larger rooster. She actually needs freedom to move about and get her legs to work again. I don't know of any way to physically repair a leg like that, other than giving her the chance of moving freely without having a rooster on her. It may never correct unfortunately.
Now just in case it would be mereks it is easy to test. First on leg usually goes forward and one goes backward. One leg will appear to be paralized. Simply put your finger under one of her feet and see if she is able to grip your finger with her toes.
In the meantime get some St. John's wort and mix it in her water. Open the capsule and just poor it in. It will turn the water black. chickens don't seem to mind the taste at all. It works in chickens and deadens the impulse on the nerves allowing them to function better. I have pulled more than one lame chicken out of the problem using St. John's wort for a while.
I've seen this happen more than one time. Especially on a smaller bird with a larger rooster. She actually needs freedom to move about and get her legs to work again. I don't know of any way to physically repair a leg like that, other than giving her the chance of moving freely without having a rooster on her. It may never correct unfortunately.
Now just in case it would be mereks it is easy to test. First on leg usually goes forward and one goes backward. One leg will appear to be paralized. Simply put your finger under one of her feet and see if she is able to grip your finger with her toes.
In the meantime get some St. John's wort and mix it in her water. Open the capsule and just poor it in. It will turn the water black. chickens don't seem to mind the taste at all. It works in chickens and deadens the impulse on the nerves allowing them to function better. I have pulled more than one lame chicken out of the problem using St. John's wort for a while.