From the angle of the picture, to me, looked like a little crest. That's why I thought Serama/Polish cross, but not purebred Polish. After zooming in on the picture I can see it's not a crest. That guy just has some funkiness going on as far as fluff.
Poor sweetie, what happened to her bum? I'm curious too because I was at a local farm recently and a lot of the chickens were missing feathers on their bums and their bums were so red! I was wondering what that might be? I'm sure she's looking forward to joining the others