Quick question, because I am sitting here stressing (I hatched all my birds and handraised them so i truly love them)....do you guys think the attack was potentially somewhat painless for her (like the force or shock preceded death). She was intact, eyes closed, head intact, etc. despite what happened with her torso. It just makes me so sick and sad. I know no one is a mind reader and there were no witnesses, but I am just thinking about her and distressed
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I also think that a raptor was involved in the death of you chicken. To answer your other question in a truthful manner I really don't think that you want a truthful answer to your question about a chicken suffering an awful death at the hands of a hawk.
Instead you may wish to search this web sight for posts about chickens who survived after a hawk had made a meal out of a living chicken.