I'm so sorry about your loss. :aww It's one of the hardest things about having chickens...all those predators who want to kill them!!
Having had a similar experience, I know just how you feel. When I first had chickens back in the 1990's, I lost 20 of my flock of 25 chickens (and they were ALL pets!!!) to a coon, IN ONE NIGHT!

un I know coons have to eat too, but I hate that they sneak in, in the night and kill innocent sleeping chickens. I caught the one that killed my chickens and I wasn't very nice to it!! If it would have killed one, fed on it and left, I wouldn't have been nearly as upset. But it killed 20 chickens and just left them all over. It was a total massacre! It was as if he killed them just for the sport of it.

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Re: your daughter. When we have pets, that's one of the hardest things...having to tell a child that a favorite pet has died. I think being honest with her and as someone else suggested, let her help you pick out new babies would be the best solution. It's a hard lesson to learn, but it's part of having pets. Make sure she knows all the secure things you're doing to protect any new chickens and let her help you lock up every night!
I definitely think you should get new babies and make sure that coop is super-secure. Don't put anything past a coon!!! If it can get it's hands in under the door and pull the corner of the door out ...it can get in!!! I put latches on the top, middle and bottom of the door on my present coop!
We keep a baited live trap just outside the door of the shed/coop we keep our chicks in now, and we also have a baby monitor on them.
No coon is going to get my babies ever again!!! Not if I can help it!!