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Okay, ON AVERAGE the blue egg gene should go to half of her chicks. Of course averages don't always come out right with small sample sizes (like hatching ten chicks and getting a split of 8/2 for genders. I'm sure plenty of us have seen things like that.)

OP said the Starlight Green egger hens lay green eggs. That means each one must have at least one blue egg gene. Otherwise they would be laying brown eggs. If the hen has one blue egg gene, she gives it to half of her chicks. That gives a 50/50 split. Since the rooster is a brown-egg breed, he...

Yes, that is what I would expect: 50% of chicks get the genes to lay green eggs, the other 50% get the genes to lay brown eggs.