Don't worry!!! You are not the only one with a crowing Golden Sebright hen!
My pullet spontaneously crowed today and I have 3 Cockerels with her along with 2 other sebright pullets and several other breeds. I don't know why she did it and I don't really know how to stop it. Although, her comb isn't nearly as big as Pippa's. But she is only 15 weeks old... Are you sure it's her that's laying the eggs?
Here is my pullet that crowed.
And just for comparison here are some of my cockerels.
Edited to Add: The all three cockerels are crowing. One was a late bloomer and didn't develop his comb and wattles until a little later after the others. I thought he was a pullet but then he got redder.
Well, here's a new one on me. I went back to Feathersite, and read about Sebrights. I've never had Sebrights, but they are cute little things. Anyway, I found out that the males are hen-feathered. I had no idea that ever happened, but evidently this is the case with Sebrights and Campines.
Now that I've seen this, I have to ask, are you certain Pippa has been laying eggs? Is it at all possible that another pullet laid those eggs, and Pippa could be a boy?