I'd say your feed store buys from a major producer that tells half-truths about their breeds to make an extra buck and your feed store doesn't know enough/is managed in such away that they take the hatchery's word that the chicks are what they are. Maybe they even corrected the spelling themselves, maybe not.
Even the description on the label is they lay "blue, pink, green or olive drab!".
Pink is just a light brown. These aren't true ameraucanas. Ameraucanas never lay pink or olive and rarely lay green.
They also list the muffs and beards as "sometimes" on the label. Ameraucanas breed true - every single one (even my crummy ones that lay brown) should have beards and muffs.
Note also that they don't list a color variety. The Orpingtons are Buff colored, so they're buff. White Rocks get labeled White, Barred Rocks labeled barred. Ameraucanas have specific colors too, so why isn't it listed? There's no Blue/black/splash ameraucana label, or wheaten/blue wheaten, or white, etc. It's because it's a group of mutts and the color is random.
And of course, your own hen doesn't meet any APA recognized breed color. And it's legs are green not slate.
You have an easter egger, friend. And it's a lovely bird, they're great birds to own, I own a few myself and breed them and they're personable, lovely, etc. But an ameraucana it is not.
Having said that, the egg could have come from the EE or any of the other birds listed. Your easter egger may lay a blue or green egg yet. But she'll always be an easter egger.
