She has a pea comb. With easter eggers a pea comb is very closely linked to the blue egg color gene. 96% of the time an easter egger with pea comb will lay either a blue or a green egg. All my smooth faced easter eggers did have pea combs. So odds are highly in your favor!
I got several clean-faced "ameraucanas" (easter eggers) from ideal hatchery several years ago. Approx. 2/3 of the clean faced DID lay blue, the rest laid green.