I'm so mad. I had a predator attack last night. Nothing got into my "coop" setup, but some of the smaller chickens were near the edge. This was their first night in the big run and I thought they would be okay. A couple were near the edge on a cinder block, and I think a raccoon grabbed them. Two had heads missing, and the third one is alive, but barely. She has her leg almost completely bitten off. Is there any chance of me cutting her leg the rest of the way off and saving her? I just removed her from the enclosure and put her in a critter cage inside. I have to decide to do something in an hour or so.
I feel like such a jerk. I tried to predator proof it the best I could, but I didn't put hardware cloth around the bottom because it was temporary. I was supposed to have my shed delve red by now, but the guy called yesterday because his truck broke down.

. I don't know what to do...
Edited to add: She is chirping and alert, raised her head to look at me. I put some flour on her temporarily as a styptic. I think I might clip the leg and see if she makes it.