10 month old hen acting strange

[Emrosenagel]

This started about 5-ish days ago and new behavior seems to be popping up every day. It’s just one hen, about 10 months, a mystery breed. Normally, she is great layer, very active and loud, a piggy. But five days ago she stopped laying and about 3 days ago, she’s been going to bed with a small crop (not empty, but she is normally stuffed). I also noticed she has grown some pretty gnarly spurs. Two days ago, she was calling over the other hens to eat (something she has never done before) and being aggressive toward the other hens. She isn’t super interested in treats anymore, but still eats them, albeit slower. And starting today, her feathers are just falling off. I see no pin feather on her.
I don’t know what’s going on with her, but I would like some input. The only recent change has been the introduction of a cockerel, about 4 months old (serama).

Like, what is happening to her? Is she molting? Sick? Turning into a rooster? I’m so confused.

 

[azygous]

It can happen that an injury to the functioning ovary can activate androgens and that can cause a hen's behavior to change to more aggressive.

But declining daylight can also halt egg laying. And when a new chicken joins the flock, it can further affect behavior. When laying is curtailed, there are fewer nutritional demands on the hen's body so appetite also drops off during the dark winter months.

Probably these behavior issues will self correct when normal hormone levels return in the early spring, beginning in February in the northern hemisphere, assuming that's where you live.

 

[Emrosenagel]

It can happen that an injury to the functioning ovary can activate androgens and that can cause a hen's behavior to change to more aggressive.

But declining daylight can also halt egg laying. And when a new chicken joins the flock, it can further affect behavior. When laying is curtailed, there are fewer nutritional demands on the hen's body so appetite also drops off during the dark winter months.

Probably these behavior issues will self correct when normal hormone levels return in the early spring, beginning in February in the northern hemisphere, assuming that's where you live.

I do indeed live in the northern hemisphere, but central Florida. Thanks for the input, I was getting nervous about her, but this helps