I have a broody blue Plymouth Rock!!

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The hatchery grade Barred Rock has likely been "spiked" with other breeds to increase growth rate, egg laying and so forth. Hatchery birds are smaller, feather much faster, have much messier baring, start laying eggs earlier and lay heavier than the older "heritage" lines of Barred Rocks bred to the Standard.
The dark wash on the legs sometimes betrays that a production red was probably blended in a few generations back. Some black wash is a normal Barred Rock pullet feature. The greenish cast to the black feathers is common with many black birds and doesn't, of itself, betray mixed breeding.
Remember, the Barred Rock is a composite bird originally created by blending many birds of that time, 150 years ago. Keeping that balanced mix of genetics is what Breeding to the Standard means.
If birds are not bred carefully to the Standard (description) written for them, they go all kind of directions, even without bringing in other blood to increase production, which gives the hatcheries more profits, of course. Hope that helped.