New Hen getting bullied??
A single hen is really one of the worst integrations. Everyone in the established flock knows she is a stranger, and might eat all their food. Everyone wants to peck her to make sure she knows her place.
But all is not lost, there are tricks you can try. If at all possible, pick a middle hen in the current flock, and put her and the new hen somewhere else for a good week. Now these too probably won't get along at first either, but it is one on one, so should be fine, just a few skirmishes as they work it out. Then introduce the pair back to the flock. After 10 days, the flock will have forgotten the original hen and be positive that they have two new strangers to eat up all their food, but even a mean hen can only peck so much, and with two new birds, it kind of spreads the pecking out.
Setting up multiple feed stations also help, and better is a little wall such as a piece of plywood, so that birds can get behind it and out of sight of the other birds. If they can eat there, where out of sight of the other feed bowl, so much the better.
Do take a look around your run, is it just an open rectangle, with only the ground level available to your birds? Add multiple levels, pallets up on bricks, extra roosts, all make the run more interesting, and increases the use of all dimensions of the run. I may make it look a bit cluttered, but it adds usable space to your set up, lets chickens get away from each other and out of sight.
Good luck, these are some ideas, but really if you do nothing, ten to one, in a few days, they will be over it. As long as they are not drawing blood, leave them alone is very good advice.
What has worked for me in the past....Put the hen in a metal dog crate...Look no touch pen for a week....Chickens are mean...After a week introduce her while free ranging in the evening for an hour before dark...Herd them into the coop to bed and usually in the morning they think of her as not a threat...Might not love her, although the bullying wont be so bad....If your nervous? Just free range together and put her back in the no touch pen...Keep trying little things..It will workout...
Edited by chickens really - 9/23/16 at 5:05pm
Did you just dump a new hen into an established flock?
Chickens are naturally territorial. They don't tolerate "new" birds invading their space.
They will attempt to drive off any new bird. Given the fact the new bird cant leave to get away, the level of beating it takes depends on the "personality" of the dominant hen in the flock. Some are more tolerant than others.
At the best, the new bird will be at the bottom of the pecking order and picked on pretty bad. Worst case, it could end up dead.
Separate the new bird immediately and use the acclimation steps recommended by others.