She looks very guilty. Sorry for your losses but the labs and mixed labs that I have had in my lifetime could not be trusted around fowl. They have been sweethearts though.
Ole Brer Fox made his rounds this morning at daybreak around my coops and even lunged twice at the fence at my flock of fourteen large breed hens and one rooster. But he was no match for the 16 gauge wire he threw himself against. It was a handsome example of the predator type though.
Sounds like a mink or weasel but they are generally nocturnal as are racoons. Foxes tend to take one bird at a time but keep coming back once they find a source of food. I feel for your losses.
I think all creatures have a purpose but like you do wonder about raccoons. This week I have also had a predator hanging around my property that I have never seen up close and personal before, a Bald Eagle. Luckily, my chickens are in secure coops/pens or they would be in serious jeopardy...
Crows will definitely take baby poultry and other baby birds as they are opportunists but the ones around my place also keep the various hawks on the run so they are okay with me.