Hen acting like a rooster.

We have three chickens. They are all very clearly hens and two of them are laying eggs. One of them however is not laying eggs and acts very much like a rooster. I doubt that she has been taking male enhancement products but I wouldn't be surprised if she started crowing soon. I have read about hens that in rare cases will assume the role of a rooster when one is not present. We had a rooster for a brief period that we thought was a hen and subsequently found a new home for. I am wondering if one of the hens felt the need to step into his shoes? This hens struts around and acts like the king of the castle. As far as I am concerned as long as she eventually lays eggs she can act like a rooster.