I don't think she is in pain. She would have gone out with her friends if she were mine. I especially would have trouble adding month old chicks. Surprised she isn't bullying them. Each day bring new learning for me and I always see something unexpected.
But whatever seems to be working for you is fine! You might find she thrives better outdoors or not. But being out in fresh air with room to move around, would be my choice. I wouldn't keep her permanently indoors as a pet. That's a lonely life for a chicken. I know it's difficult to make those decisions. Best wishes whatever you decide!