Well, it's done
It's better for the hen - but we're still sad
She was so sweet ...
I couldn't get in touch with the vet - though if I need to do this
again in the future I'll try to call them again.
I wanted to get this done quickly before he had a lot of time to re-think this. We talked about it - since I do think it's fair to let him know -it will give him the comfort of knowing we did what was best to end her suffering . (he's 12 so is old enough)
We are going to bury her tomorrow since it started to rain right afterward. Almost as if nature herself is saddened.
I ended up using ether. She was a bantam so fit onto a gallon size plastic bag.
I covered her eyes and placed her in the bag with a soft cloth to sit on. I sprayed the cloth and closed the bag.
It was very quick. She was unconscious within literally about 3 seconds and had stopped breathing a few seconds later. My son was not allowed to watch - and I'm glad because the involuntary twitching after she stopped breathing would have bothered him.
I held her on my lap - I don't think she even knew what was happening - or maybe she did - either was she seemed very calm and at peace and being held on a warm lap.
My son is doing well - knowing she went quickly and was calm and happy for her last day. She spent a few hours propped up so she didn't fall on her side outside in the sun out of her sling pecking at stuff on the ground.
Thank you everyone for all the good ideas, help and hugs.