Solid white breed that's slow to feather out?

[Tracyree]

I have a mystery chick that was all yellow fluff, solid white feathers coming in. She's 5 weeks now and has no head feathers at all, still fluff.

Looks like a single comb and tan legs.

 

[Illia]

Sounds like a Broiler chick.

 

[magicpigeon]

Pics? I'd say broiler too, but to be sure...

 

[Tracyree]

Posted her last week, but I'll get some better pictures today.