When you break an egg to eat it, peel the membrane off the inside of the shell and you will see the blue egg base color.
Brown coatings can vary from egg to egg, from chicken to chicken....sometimes that brown coating will wash right off or can be scratched. The brown coating can also fade in...
Fascinating video! Good job.
You probably have an Easter Egger rather than a pure breed Ameraucana, she was probably from a cross between and Ameraucana and brown egg layer...thus the green eggs.
Brown egg coating over blue egg makes green....sometimes the coating doesn't 'stick' well and...