I've had hens dance to show dominance towards other hens, or roosters. Roosters also dance towards other roosters. Roosters will mount roosters, & Hens will mount hens to show dominance.And rn she hasn’t crowed or showing any aggression. Even my systers porcelin d‘uccle roo did the wing dance to her and Smokey just stood there ( My sisters D’uccle roo is the same age as Smokey, he crows but it sounds bad lmaooo )
12 weeks is kinda early for crowing to start, usually it happens between 4-6 months of age.
Occasionally crowing can happen between 3-4 weeks of age, but both sexes can crow, I've had it happen.