Hi, I can see that you have had a really hard time this last weekend, it looks like her injury was much more serious than expected. Im sorry for your loss and I hope your family can cheer up again very soon.
Unfortunately our chickens do get illness and injury and this is part of our ongoing learning and experience that we get from our chickens.
There are some threads about humanely putting to sleep our pet chickens, and I have this printed out in my emergency file for when the times comes.
We all get faced with this dilemna at some stage.
Please dont get disheartened, we all go through this.
Im so sorry we couldnt help you better with this.
Hugs to you and your family
HelenX