Could be we're getting legs, feet and toes mixed up, from not reading the thread carefully before commenting. My understanding is that the chicken has legs but not feet. Legs that end at the ankle, so to speak. Unless the second foot hasn't completely fallen off yet.
The things I see are...
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I am confused as to how many feet this hen has left? First one fell off, but them you cleaned them both. You say the others will most likely kill her, then that you don't know what will happen.
I am very sorry this is happening, but I still think humane euthanasia is...
I would have her put down in the most humane way possible. Quality of life is an issue here.
ETA, and then rethink your coop/run setup, to prevent a recurrence in another bird.