That was my chicken; "she" passed away from cancer at age 4 1/2 and was confirmed at necropsy by my state lab to have an ovary, oviduct and two ovotestes. However, "her" behavior was completely opposite the subject of this thread, she never showed any aggressive behaviors whatsoever. I am currently researching to write an article about this fascinating subject.
@Purelychicks , my intersex chicken was an absolute joy to have around, while your "hen" is literally a threat to your physical safety. She may be laying eggs, but she is showing typical behaviors of a hormone-crazed cockerel. It IS possible she is a true hermaphrodite (now called gonadal intersex). The condition is very rare, but yes possible. The fact that she looks more like a hen and is laying eggs, yet her behavior is that of a testosterone-crazed, aggressive cockerel is very suspicious. It is more likely she has a compromised left ovary and her right ovary is becoming dominant and producing testosterone is more likely, but IDK if she would still be laying eggs if that was true. If you are currently opposed to euthanizing "her", I would immediately separate her from the flock and keep separately penned, or separate the rooster from "her" flock to see if her behavior reverts back to her former norm.
Whatever you decide to do, please don't hold "her" or let her anywhere near your face. I agree with the others that you could lose an eye if you do so. The fact she was very friendly before her behavior suddenly changed is another typical sign of a cockerel reaching puberty. The fact she looks like a hen but acts like an aggressive cockerel is opposite of my intersex chicken, which looked very masculine but her behaviors were that of a sweet and docile hen. If I had a cockerel acting this way, I would absolutely euthanize in a heartbeat. If you eventually decide to do so and are curious, you can send the carcass to your state lab for necropsy, to have confirmed if there is anything abnormal with her reproductive system. Request a microscopic examination of her gonads if you do so.
