Is this a pullet or a roo?

[SpeckledPullet]

I bought this chicken two weeks ago. She looked like a pullet, but in the past two weeks the wattles and comb have almost doubled in size. I was told she is 9 months old. No crowing or mounting, but absolutely the most aggressive hen of the bunch. She will BITE my fingers and try to yank them off. It really can hurt quite a bit. She also will ruffle up if I annoy her for any reason. Her feathers look round to me, but I am a newbie so I don't know much to compare to. What worries me are the wattles and comb becoming so much larger and darker in only two weeks.

The first pic is the day I bought her. The rest of the pics are from tonight. Sorry, I had to use a flash which is making the feathers look a bit more pointed than what I think they look like in actuality.
2 weeks go

Now (1st pic is true to color)

 

[The Wolf Queen]

She looks like my 2 Australorp hens.

 

[Cindiloohoo]

Both.

 

[Goose and Fig]

Australorps have big floppy combs (as compared to Orps). She looks normal.

 

[gritsar]

Pullet.

 

[Happy Chooks]

You have a girl.

 

[M To The Maxx]

Pullet

 

[Elite Silkies]

Aussie Pullet

 

[MuranoFarms]

Quote:
huh?

 

[SpeckledPullet]

Good to hear! I was thinking she was an Orpington. I looked up some pics of Australorps and she definitely resembles the breed. Maybe I finally solved the mystery of her breed as well as gender, lol.