I am and have been on both sides of the fence. My first responsibility is to my DW, and if she says no it is no even if I disagree with her. Most times I would rather cull then keep a bird hanging on. But she also understands it is up to her to help me with the care and increasing the quality of life of the injured chicken, and I did not see that willingness in any of the OP posts. Instead what I saw was her asking for us to make a decision for her, and there will always be two sides when that is done. Now had she just asked for advice on how to care and make the chicken happy it would have been different.
To give an idea on the blind hen, when I am not doing chores and the hen is not eating she is in my lap purring just like she is right now. When my wife comes home it is her turn, and she hand feeds her treats while sitting with her. For the rooster with the torn tendon it meant casting and recasting his leg, again holding him to keep him from further damaging it in the beginning, and still one month later changing bandages every other day, and keeping an eye on him to prevent further injury. The one eyed hen keeps to herself and wants limited social contact with the other chickens, which means she wants to be held and loved by us a few times a day for attention. Not everybody has time and patience for this. With all due respect to the OP I do not believe they have the desire to go to the extent that we do, if not cull the bird soon to let her have relief.
If you do keep the bird alive they WILL be forever spoiled, even when they learn to adapt and pain fades they will still want the attention they got from the care giver, and always be the target of the other chickens.
To give an idea on the blind hen, when I am not doing chores and the hen is not eating she is in my lap purring just like she is right now. When my wife comes home it is her turn, and she hand feeds her treats while sitting with her. For the rooster with the torn tendon it meant casting and recasting his leg, again holding him to keep him from further damaging it in the beginning, and still one month later changing bandages every other day, and keeping an eye on him to prevent further injury. The one eyed hen keeps to herself and wants limited social contact with the other chickens, which means she wants to be held and loved by us a few times a day for attention. Not everybody has time and patience for this. With all due respect to the OP I do not believe they have the desire to go to the extent that we do, if not cull the bird soon to let her have relief.
If you do keep the bird alive they WILL be forever spoiled, even when they learn to adapt and pain fades they will still want the attention they got from the care giver, and always be the target of the other chickens.