Green eggs?

I newish to chicken keeping. 2 years in and just recently went through and let my broody hen hatch two chickens last fall. But what is so weird! Is that the mom is a grey blackish jersey giant and the dad is a silkie Orpington. The chicken they hatched lays small GREEN eggs! It’s almost like she is a dwarf chicken about half the size too. I thought you had to have a blue layer and a brown layer mix to get green eggs? Has anyone had this experience?