Harriet was isolated yesterday so we could keep an eye on her. After a couple of hours she seemed to feel better and was trying to walk around so we put her back with the girls in a shady corner of their pen where she could still be isolated but close to the others.
After researching just about everything that could be wrong with chicken legs over the last couple of days I had a terrible thought that perhaps she may be egg bound and was ready to take her to the vet. Isolation was initially to see if she would lay an egg which would cancel that out. From what I've read and from what others have said I don't think that is the case though. She is bright enough and is eating (and pooping). She doesn't have a swollen abdomen or any mess around her vent.
This morning I don't think she'd moved, but when I offered food she was interested yet the others got over enthusiastic through the divider fence. I brought her inside where she ate and drank under the airconditioner and noticed that her middle toe on her left food is swollen.
She is now camped out in the corner of my sewing room happily sitting in a box with straw. She has also had a foot spa (soak in warm salty water) and aloe applied to her sore foot.
I hope that is the issue and we can get her back on two feet again soon!