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Eating feathers shouldn't hurt them. As long as they've got enough grit in their gizzards, the feathers will get ground up just like everything else does.

This is exactly what I would advise right now. As a long-term thing, you may have to keep the blind chick and the mean hen separated permanently. You could get rid of one, or keep one in an isolation pen, or keep the chickens split into two groups so one can be in each group.