When I saw the pics, rats, were the first thing that popped to mind.I understand what you're saying and although I agree she most likely would be dead if this were from a predator I know from many personal experiences spring of 2017 that this isn't always the case. Unfortunately we had a very bad beginning to 2017 that involved losing most of our juveniles to rats that were 12-18 inches long not including the tails, some even longer. These rats were predatory and would attack the unsuspecting birds while they slept(although at this point they were large enough and the juveniles small enough yet to overpower the birds). They would then eat into the vent and would eat out the intestines of the birds. We found many dead of course but about 1/3 we found alive and walking. With no digestive tract. These birds were of course put out of their misery immediately. It is possible that some of the aforementioned attacks were from the mink although we had no clues it was around at that time. However we did catch rats in the coop so we know the were a large part of the problem if not the whole problem.
We also later discovered that we had a mink that was also possibly attacking and killing our birds.
Thirdly yes we do know once the body cavities opened and the innards spilled out the blood did attract the other juveniles. However they never opened their hatch mates themselves or it would have continued after the rats were dealt with.