You know, she also may have gone on her own. Once they die, the others will peck at them also, ecscpecially if one starts leaves a wound. Then they all pick at it.
I really think it was, IMO. A raccoon isnt going to relatch the door behind them. They really came close to killing my NN hen. Broke her beak, blood everywhere...I am really suprsied they didnt kill her.
How new was the chicken?? Are you sure it wasnt the other chickens...I have come VERY close to loosing a hen that way.........when I posted about it I was suprised how many people had similar experiences.