I don't think she has scaley leg mites.
They pretty much always invade toes before legs, so you would be seeing very raised scales on her toes first, & then progressively moving up her legs, causing more raised scales as they move up.
Underneath scales infested with these mites you see build-up of kind-of-moist, powdery white stuff. This gunk is made up of mite eggs, dead mites, etc.The build-up of the gunk is what cause the scales to become raised.
It may be that at the same time she got her injury on her leg her hip became injured as well. Maybe caught her leg in something, which caused the scale to get scraped away from normal position on the leg, & then her hip got wrenched as she struggled to get free?? Who knows.
If she has a hip problem, keeping her confined to a small area will be useful helping her heal because she'll keep the hip more still.
It would also be important for her to have flooring with good traction so her hip doesn't get twisted from her feet slipping. An old scrap of carpet under a few inches of shavings could make a good temporary floor while she's recuperating. But if you use it more than a few days, you should dust it with Sevin or DE to prevent mites from possibly moving in.
Best wishes in figuring out best ways to treat her.