If the bird carries two copies of the pea comb (P, P) then when bred to a single combed bird the pea comb the offspring will have the pea comb but they will be heterozygous for the pea and single comb (P, p) if you breed the offspring to a single comb bird then the resulting children will be...
Crossbred cockerel
Una cannot be an Ameraucana x Marans as the pea comb is dominant and she would have a pea comb. She most likely is an Easter Egger x Marans.
Chickpea, Scrappy, Omelet, Pepper, and Sunny are pullets.
Pullet
Cockerel