Technically, and Easter Egger is any bird with the blue egg shell gene. Hatchery sourced "Ameraucana" are actually descended from the original imported stock that true Ameraucana are derived from. It's the hatchery birds that most people know as Easter Eggers. But your bird would also fall into the general category of Easter Egger, since one parent was true Ameraucana and can be guaranteed to have a blue egg shell gene.
I know where my bloodlines come from and I have been breeding ameracaunas 20 yrs and am a certified breeder and work with my local vet school to preserve the bloodline. Actually in the US there are no pure ameracaunas as the blood lines have been diluted out. So there's that.