As for your 2 chickens getting along, first off, do not put your injured bird back with the other one until she is completely healed.
Yes, it would be nice if chickens could all just get along. Unfortunately, that was not programmed into their DNA. Chickens are cruel when it comes to outsiders until the pecking order becomes established. Once that is out of the way, peace should once again return to the kingdom.
The general rule for adding new birds to an already existing flock is to wait until the newcomers are roughly the same size as the established birds. That way, they can at least defend themselves. You can't just put a new chicken in with your others just like that, they will do what they did, attack her.....
Unacquainted chickens are going to fight, and unfortunately there is not much that can be done about it. It is just in their nature.
What I have done before with new chickens is keep the new one in a smaller cage in the coop and/or in their run during the day so the others can see her but not hurt her. I've done it sometimes up to a week, and then one night I will put the new one on a perch because I know they won't bother her and in the morning they all run out like they've always lived together. But I would suggest that when you do finally put them together for the first time that you have the time to supervise them and also make sure you have the garden hose ready just in case anyone gets a little too out of hand. One quick shot of water should do it.
Yes, it would be nice if chickens could all just get along. Unfortunately, that was not programmed into their DNA. Chickens are cruel when it comes to outsiders until the pecking order becomes established. Once that is out of the way, peace should once again return to the kingdom.

The general rule for adding new birds to an already existing flock is to wait until the newcomers are roughly the same size as the established birds. That way, they can at least defend themselves. You can't just put a new chicken in with your others just like that, they will do what they did, attack her.....
Unacquainted chickens are going to fight, and unfortunately there is not much that can be done about it. It is just in their nature.
What I have done before with new chickens is keep the new one in a smaller cage in the coop and/or in their run during the day so the others can see her but not hurt her. I've done it sometimes up to a week, and then one night I will put the new one on a perch because I know they won't bother her and in the morning they all run out like they've always lived together. But I would suggest that when you do finally put them together for the first time that you have the time to supervise them and also make sure you have the garden hose ready just in case anyone gets a little too out of hand. One quick shot of water should do it.
