I agree with Wyorp. It's very hard to know at the time what to do, and no matter what a person decides...you second guess yourself later. It's very evident how much you cared for your hen and she would have sensed that as well. Chickens are amazing that way. You did the very best you could. That's all anyone can do.If you had put her down right away, you may have still felt guilty wondering if you
could of/should of done more. At least now you do know that you tried. She received extra attention, comfort and love in her last days and that is what matters.
I'm so sorry for the loss of your hen.

I'm glad she had such compassionate people caring for her at the end of her life.