We ordered the same rainbow layer assortment from Murray McMurray this summer. We received 6 chicks that look just like this adorable little cinnamon girl. I believe they are Easter Eggers, as the hatchery openly states they do not breed/sell true Ameracauana/Auracaunas. The exotic chick in our assortment is actually a Golden Laced Wyandotte, and she is growing up beautifully! But, she's very different from these little cinnamon chicks--much darker and with the red tip on the beak.
7Mile, from those baby pics your girl looks like an EE to me as well. She had that cute chipmunk look as a baby that turned into the splotchy black and browns of an adolescent. Would love to see her full grown