A Starlight Green Egger is made from a Prairie Bluebell Egger mixed with other genetics. The Prairie Bluebell Egger has mixed genetics to start with. These are not breeds, just marketing names, and the genetics are totally mixed. You don't know what genetics they have. What they do have is really going to be mixed up with dominant and recessive genes.
Dominant White acts with what would have normally been a black feather to give you white feathers. Since it is a dominant gene you only need one copy of it at that gene pair for it to act.
When you cross crosses of crosses like your starlight green egger (even with a breed) you can get all kinds of different results. My guess is that that chick got Dominant White and Silver from its mother and mostly black from its father. Silver is dominant over gold that the Marans would has. You wind up with what should be a white chick with leakage. Leakage is common with crosses. And don't be too surprised if the hackle feathers turn out to have a yellowish tint if it is a boy. Silver does that.
@Mlf9791 welcome to the world of crossing crosses. It's like opening a mixed box of chocolates, you never know what surprises you might find.