Help me sort some things out.

 Life on the backyard farm always has its surprises, but I never expected Cookie, my hen, to start acting like the local rooster! Lately, Cookie has taken a strange interest in two of my other hens—not just following them around, but actually trying to mount them, which is behavior usually seen in roosters. At first, I thought maybe she was just being dominant, but it's gotten persistent enough to raise concerns. Could this be a sign that her coop is too small, and she’s stressed or frustrated? Or is it something else entirely? Everything about keeping chickens seems to come with an unexpected price tag these days, and solving this mystery might be another one. Has anyone else had a hen like Cookie before?