It depends on if she carries the silkied feather gene or not. If so, half the chicks will be silkied. If not, all of the chicks will be smooth feathered but will carry the recessive silkie feather trait. Depending on whether she’s heterozygous or homozygous for the naked neck gene, either half...
Cochins usually lay off-white, not brown, and it seems that this cochin is not laying brown since he produced blue egg laying offspring. Therefore, 50-75% (depending on the cochin/EE’s genetics) of the female chicks will lay blue or blue-green eggs.