I have a new girl in my house. She’s 4 years old and has had what seems to be visuals of the previous plucking (or not? I'm not a pro here). This is what she looks like now and her chest it’s soft feathers and without much of the normal color. I just saw this feather fall off her when she shook how can you tell if it’s normal feather loss or from plucking? Is this normal or something to worry about?