Yeah the hen is typical of a silkie cross. If you handle her or the chicks, lift the wings and look around the butt to see if the skin is black or greyish as that would be the silkie trait showing through on those birds.
It also appears at least one chick may have silky feathering- kinda looks shredded on the wings and downy-furry on the body?
The black skin is a dominant trait and usually shows up in crosses and mixes... silky feathering is recessive and doesn;t show up in the first generation crosses but if you either breed them back to a silkie or let them breed amongst each other, it will eventually show up again- so if at least one chick is showing silkie feathering that is your answer to the chick's probable parentage- at least 2nd generation down from a cross with a silkie.