My sweet Penelope is a Belgium D'Uccles and she lays a white egg...or is she the light tan...ask her sister the BO bantam. One lays the white, one the tan...
Lovely looking little hen...
Going to throw this in now that I've seen the egg color. You said the breeder had some mixed hens.
Columbian Wyandotte...based on small comb and coloring of the chick and the feathering Crossed with an EE for one parent and then crossed with Dunccle for the feathered legs. There may be Cochin in there somewhere but your breeder didn't mention Cochin.
All of these breeds have pea comb or rose comb. Your little hen lookes to have a pea comb. There are bantam breeds in these.
Here are photos for comparison