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Not necessarily bullied but the others might be taking a nibble of her tail. No need to separate her, I'd try increasing protein for the whole flock since protein deficiency can be a contributing factor to feather eating - like if right now they're getting 16% layer try 18-20% grower or all...

The pin feathers on the neck are indicative of molt. Molting birds may choose to stay away from others (sleeping in nests) and may go off feed, so those sorts of things are normal. The tail feathers look to be chewed off at the ends. Have you noticed any other birds with similar feather damage?