Hen doesn't want to leave the coop.

Today is the third morning in a row that one of our hens, Big Head, (a leghorn cross, with EE I believe. she has a big head, hence the name and a VERY small comb like some pictures of EEs i have seen) has not left the coop and flocked to the tractor with the other hens. After I got her into the tractor, I observed this morning that she might be the low chicken on the totem pole. All the other hens (15 hens total with Big Head) were flocking around the food and getting into the grit bin and Big Head was hovering around the outside of the group looking for a way to get to the food but decidedly separate from the group. She doesn't seem to be harmed at all, the only ruffled feathers are from me catching her to put her with the rest of the flock. I'm considering putting her in the stew pot with one of our roosters we've set aside for culling because it is a hassle to have to drive her to the coop separately, but I would miss the mint green egg in the basket of brown/cream/white eggs.