Honestly I think she looks pretty good based off of the pictures. My BO was all fluffy like that when she was a chick, fluffier than my other breeds. I would guess that she may be too warm if the pasty butt keeps coming back. Maybe if you move the light up a bit, maybe like 6 in. further from the brooder, she will still get the warmth but won't be too hot. She sure is cute.
Well, your BO is definitely lookin' good, but how the Australorp doing today?