Chicken breed???

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So I just learned I had a Speckled Sussex cockerel and not a sex-linked pullet like I thought. So now I'm wondering what breed my dear Daine might be? She's 15-16 weeks young. Picture below:

 

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Production Blue or Blue Australorp, where did you get her? And what color are her legs?

 

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Production Blue or Blue Australorp, where did you get her?

I got her from Tractor Supply Co in Brentwood, CA. It was my first time looking around at chicken stuff and I got overwhelmed and you know...in one ear and out the other!