hi there, she/he might be a little slower on getting her/his feathers. You can however increase protein and see if this helps because feathers are all protein. are you sure no one is plucking them out or eating them?? if they are this is also a sign for more protein..I did a bit of reasearch on this and besides mites, or lice, or fleas, this could be a cause?? id increase protein and see if it helps. do you find the feathers?? or are they gone?? if they are gone they atre eating them if not gone try increase of protein and see if this helps. Meal worms are a great source of protein. hope this helps best of luck!!!