The one on the left definitely does, one on right may have the beginnings so treat her too.
Just slather on some vaseline or bag balm to suffocate the mites, wiping up the foot and leg to get it under the raised scales. Try to wipe the excess off. It's kinda messy, it will get on her belly and breast feathers and collect dirt but will wear off in time.
Do that once a week for 2-3 weeks, then wait....you might see some improvement soon, but it can take weeks for the scales to fully regenerate.
There are other treatments, but that's the easiest and it's effective.