Puck has some feathers around his beak that have hard ends (not the part that used to be in the skin, but the end that's supposed to be soft) and some have clumped together. He is a young bird, and I think he may have been handfed a few times just before he was fully able to eat on his own, as his parents eventually refused to care for him. I guessed it was just the feeding formula.
Could be that it's the same for your girl, especially if she is also a young bird!
PUCK DOH 08-29-2016