In that photo, it looks like she only has one leg. I assume she really has two and the other is just tucked up out of sight?
(Sorry, I have to ask, because she's doing such a good job of having just the one leg visible.)
Not always. Easter Egger is any chicken that lays blue or green eggs (or is supposed to lay one of those colors) but does not meet the description of a specific breed.
Ameraucana-crosses are one kind of Easter Egger, but not the only kind. The blue egg gene can come from Ameraucana, or...
The current website description says, "Easter Eggers are multicolored with pea combs, beards, muffs and clean, light black or gray legs and feet. They lay bluish green eggs with the occasional bird laying brown eggs."
https://www.idealpoultry.com/product/1677/47
So that matches what you...
Easter Eggers are any chickens that lay blue or green eggs, but are not a specific pure breed. Some could be bred to a specific set of standards by a hatchery, but not be right for any official breed (for example: good production of blue eggs, but feather color does not matter.)
That probably...