Hi all

This is my first year keeping chickens.
For a couple of days now there have been loads of white feathers lying around - I only have 1 white chicken so I know they are coming from Attila the Hen.

I was worried the others might have been attacking her but I have seen no evidence of that.
I noticed her preening herself tonight and she pulled out a couple of her own feathers.
Is this anything to worry about or is she just moulting?