I have had some start laying as early as 17 weeks and have had others that were closer to 28-30 weeks. Keep in mind our chickens don't always read the same books we do. Therefore sometimes they don't do things the way we expect they should!
Brown eggs from an EE?? I hate to tell ya this but that is why they are called EE because they lay colored eggs. It's just that we never know what color we will get. I just had 8 chicks chase me home from Wilco. I am hoping the 4 pollo loco will give me some of my long sought after chocolate eggs and the 4 Ameracauna (come on people they are feed store/hatchery birds, EE's) will lay some nice pink and one purple egg. OK reality check I will be happy as long as they don't lay white eggs. Those are prohibited here. And I would prefer not brown, already have enough of those.
I sure hope Drama hasn't been reading the Light Brahma threads, recognizes that she's a hatchery bird, and decided to lay at 21 weeks instead of 8 months. But, I realize that there's a very high likelyhood that my hatchery EE could lay brown eggs, too. Oh well. Eggs are eggs. As soon as they are cracked and cooked, the shell ends up back in my dirt anyway. Brown shells sprinkled all over the ground outside is probably better than blue. I have some crushed white shells out there right now - and they are pretty visible from the road.