I would burn any existing bedding including the bin. Treat your lawn and get rid of what you threw out on the lawn, burn that. It sounds extreme but if your birds are free range they could get reinfected if they come in contact with that bedding. Lice or mites might have to be treated at weekly...
I would isolate her in a large clean dog pet taxi, put foam bandages on both feet. Maybe put a chicken diaper on to keep feces off. I used the foam bandages on rabbits to help heal sore hocks. Found them on Amazon.
Looks like Easter egger or could be Americana because of the beard she has. She also had the dark line by her eyes as a baby. They can get quite large.
Are there restrictions for movable coops on wheels? That might one way to get out of having to get a building permit. The coop I have looks more like a fancy mobile deer stand