what is the correct breed of this hen?

[NewlyHatchedEgg]

My guess is Silver Ameraucana or Easter Egger. Most likely EE since you got her from a feed store. Here is a link of Ameraucana varieties: http://www.ameraucana.org/scrapbook.html Definitely not a barred rock.

 

[kat1117]

Here she is with her siblings I guess she got mixed in by mistake its OK with me.