I'm sorry if it seems like I'm being argumentative, but I am pretty sure dom is a reference to being barred or at least carrying the gene which this hen does not look to be. I was just reading a few articles on this which I included screenshots and a link I also agree that regardless of her exact line, she is a pretty bird!
https://www.scribd.com/document/424586201/Bulik-Breeding
https://www.scribd.com/document/424586201/Bulik-Breeding