Ever heard of a female turning into a male?!? I know hens can begin to crow if males are removed but Oh My Gosh! This pullet-the only silkie I have and a known pullet- has been crowing since I took the MFBD boys out. The kids didn't believe me and now I have proof! SHE has laid eggs and I even hatched a chick from her.
one of my red dorking girls crows now and then, as did a bantam cochin girl I sold recently. both have laid well and been broody. the Dorking girl tho is not 'right' this year, as her comb is absolutely huge, so I'm tending to think something's going on internally to throw off the hormonal balance... i'll be penning her in a few days with my red dorking rooster and 1 other girl, so we'll see if she's laying or just being butch.