Here is a pic of a more mature Prairie Bluebell Egger from another BYC member:
https://www.backyardchickens.com/th...cken-breeds-do-you-have.1558544/post-26422292
This bird is laying and also has the white-ish earlobes for comparison.
Here are the possible breeds in Hoover’s rare assortment: Partridge Plymouth Rock, Midnight Majesty Marans™, Sapphire Olive Egger™, Speckled Sussex, Blue Andalusian, Silver Lakenvelder, Cuckoo Marans, French Black Copper Marans, French Cuckoo Marans, French Wheaten Marans, Welsummer, Barnevelder, Prairie Bluebell Egger™, Starlight Green Egger™, Olive Egger, Salmon Faverolles, Cochins, Turkens, Blue Laced Red Wyandotte, Columbian Wyandotte, Light Brahma, Buff Brahma, Dark Brahma, Lavender Orpington
Zilla is definitely one of the Eggers. Egg color once she lays will help narrow it down.