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Interesting - can you post a picture?  Some hens crow when there is no rooster around, but I'd think it would have laid an egg by now if it was a hen.  
My production red, which has been laying eggs regularly, has decided to mount the younger black stars we integrated into the flock.  Almost every day, I see her jump on at least one of their backs and bite the feathers on their heads - basically looks like she is mating with them, but I'm guessing it's just a dominance thing.  She's the only chicken that does this, but thankfully, she still lays eggs.  We don't have a rooster, so it wasn't learned behavior.