Help! Feather eating!

I have a hen that is eating the feathers on the backs of the other hens. She is not plucking the whole feather, just the top half. I have tried increasing protein and enrichment. When she was a chick she would peck the others until they bled. She was separated and it hasn’t been a problem since. Because of this I am worried her feather eating habit will turn worse. Should I separate her? I am really worried about this stressing her out too much and also that it might break her habit of laying in the nesting boxes