Don't feel bad!
I might keep her in too, if its the only way to keep her safe.
Doing what is needed is what any good chicken keeper does; just don't expect her to understand why she is shut in. (thus its not a punishment)
I think keeping them all in for now may be the way to go, and try to teach...
No, I don't 'punish" them, although I will peck back at a cockerel if they are being teenish.
I will also chase them if they are being really bad, but not to punish them, just to reinforce the pecking order.
Shutting them up can in some cases can re-train them to stay near the coop, but most of...