EE don't have to be cross breeds. IMO there's still hatcheries selling poorly bred color crossed ameraucanas. Those are being labeled EE here.
There's also ameraucana breeders here that sell their culls as EE.
The real issue is that they aren't a breed just a label. And that label has been...
Definitely not a true Ameraucana.
Not the brown red pattern
And no she will never produce blue/green egg laying chicks unless the blue gene comes from the roosters side.
She could be called an EE but I have trouble calling a brown egg layer an EE.