Clearly not a buff orpington...what is she?

[Disheygirl]

With the black / gray spots, maybe an Austra White? (Black Australorp and leghorn mix.)
They're not as lean or small as a leghorn, but not as big as an Australorp, and their combs get floppy.

Austra White has pinkish legs....

And now that I've posted that, I realize it's not the best picture of legs.

 

[Chickimonkey]

Bought chicks from our local Rural King in early March. This little lady (hopefully!) is clearly not the Buff Orpington that she is supposed to be and all her flock mates in the bin at the store were. Any idea what she is? We purchased 6 chicks...the other 5 are all buff orpingtons like they're supposed to be, and that's all that was labelled to be in the bin, so I have no idea what she might be (we are new to chickens).

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I’ve seen pics of white orpingtons before

 

[ColtHandorf]

I’ve seen pics of white orpingtons before

White Orpingtons have white skin; therefore would not have yellow legs.