Jumping in here to ask a question. Please keep in mind I'm a newbie, but I have an Olive Egger that looks just like Olivia. The father was a Copper Maran and the mother an Ameraucana. She has the single comb. Why would the comb determine the egg color? I'm just curious.
There is a linkage to pea comb and blue eggs . Basically they like to travel together . It is not ironclad . You can have blue eggs with any type comb . If pea comb is in the mix chances are the pea combed birds will inherit the blue egg gene .