In this case I think her pecking and pulling at things is possibly her trying to eat anything and everything, possibly caused by pica; the look in her eyes is a bit deranged, not outright baleful. Animals with pica may focus on only flesh of other living things or include plastics, metals and other inedibles in their obsessive consumption attempts but whatever they focus on, it is a lifelong issue for which I know no treatment except isolation and restriction, or culling. They can end up turning their obsession on themselves too.
If she actively, aggressively attacks, she's outright mean, but if she's just trying to eat everything she's basically nuts. In neither case is having leniency or mercy on them going to be kind in the long run to you or the other animals. If she makes warning vocalizations or shows aggression to you before she pecks it's not pica.
When you say she acts like a rooster, do you mean she mates the hens, crows etc? Some hens do that but will still lay. I did however have one male who reached long past point of lay looking completely hen-like before maturing into a male, turns out it's not an uncommon genetic fault in some lines. If you were referring to her pecking as being acting like a rooster, well, violence isn't male-specific, good roosters are every bit as docile and harmless as good hens.
Best wishes with her. I personally have very, very low tolerance for even vaguely malignant behaviors as I need my animals to be kid-safe, so understand your concerns there!
