First time chicken keeper here. I got into a chicken fight with my 20 week old barred rock pullet today. I let her and the other pullets out of their run this morning and she "attacked" me. I ended up thumping her in the chest several times because she kept coming at me. After trading several blows she jumped, kicked me and retreated to the bushes. Later in the day she was back to her normal self. Since we bought her as a day old chick she has been nothing but sweet. Hopefully she remains sweet. Could this behavior be an indication of hormone changes and the beginning of laying?