How old did you say she/he is? If they can still do things like walk around in the grass and especially if you've seen her sun bathe or take a dust bath (or other things chickens enjoy), I would let her keep on unless she seems in pain. I had a one-legged silkie (raccoon ripped off her other leg so I stitched up the hole in her body) and she got around fine hopping on one leg. I gave her to a friend that keeps her birds indoors though, since it was too sad watching her get mated (the roosters would hop on her and press her right to the ground and she couldn't get away from them).
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