I am sorry for your loss. I had a weasel attack my flock last fall. I went into the coop in the morning to find total devistation, all but 3 of my birds were dead. (most had very little noticeable damage) I keep my chickens in a converted horse stall which has 4 foot high plywood walls, with chicken wire from the plywood to the rafters. The weasel was unable to get the bodies out of that area due to the 4 foot plywood wall. I discovered it was a weasel when I removed the bodies to the isle outside of the stall, the weasel came out of hideing & started retriving & hideing the bodies. (I put a abrupt STOP to that with my pellett gun!) My flock has 2 outside runs & 4 inside stalls (all connected) I still check & double check EVERY night to make sure everyone is inside & closed up at night when I pull the doors shut. (I don't even trust my hubby to close up, I want to see for myself) & with all my security, a weasel still got in.
I am sorry your daughter is so upset. Kids bounce pretty good - just reassure her she is ok. she will get beyond this.