Tell Me About Your Loner Chicken

What a beautiful bird!

I have a loner chicken too. Or, at least, I think I do. She (at least, I think she's a "she") is 13 weeks old now and has begun to set herself apart from the other 5 chicks that she was raised with. This young bird is of the Welsummer breed. I have wondered if she could be a rooster, but it's too soon to tell. Until recently, she foraged with the flock and roosted with them too. However, within the past week she has started staying behind. She will leave the flock and go off on her own and sit under the deck behind my house, or she will hang out in the garage by herself. She's very quiet and never really cackles like the other hens when they get separated from the flock.

When I give the hens a treat, she does not come forward and will not take even a sunflower seed from me. She appears to be healthy and has grown at the same rate as the other five hens. I have observed her eating and drinking as well as foraging, but for some reason she no longer wants to be a part of the flock. This week she started behaving differently about going into and coming out of the coop. In the evening, she has started waiting until all of the other hens have gone up to the roost, and this morning she didn't come down from the roost until all of the hens were out in the yard foraging. This morning I went back to the coop twice to check on her, and in about an hour she finally left the coop. I really don't know what's going on with her. I guess it could be hormones. She has never shown any aggressive behavior toward me or the other hens (2 Wyandotte, 2 Barred Plymouth Rock, and 1 other Welsummer).

Has anyone else ever experienced this where a hen all of a sudden demonstrates loner behavior?