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Very well put, I think, thank you.
 
I think the word "pet" could be confusing to a child. Perhaps the chickens are "friends" but the real pets are ones you'd never eat, like dogs, cats, gerbils, etc.
 
To @ralleia : It all is going to depend upon your child, though, and you know her best. Find that balance between your needs and hers. Some children have been traumatized (and turned vegetarian due to trauma rather than that is what their body needed) because their parents failed to recognize their child's nature and tried to force their worldview on them. Teased them about their attachment to LuLu by telling them as they swallowed what they were eating. You don't sound like that type of parent and I think you're (and she) going to be fine. She may have a hard time at first but it will likely get easier for her. It's a strong maturing point for her.
 
Perhaps if you brooch the idea with her and see how she reacts...give her some time to let it register. Bring it up again later and see how she is with it now. If she is REALLY attached to a certain hen, it might be best to let her keep that one as a pet, but explain that old age will be hard on the hen and if she ever changes her mind, to let you know. Also, try to sift in other experiences she has had with death so it has some familiarity to her and she can then relate it to her beloved chickens. Perhaps keep human death out of the picture because we don't apply the same rules to humans as we do to pets and livestock, ie, euthanasia.
 
My point being, for most kids, it is probably going to be easier to come to a healthy place of choice about being okay (or maybe even very okay!) with killing things they care for, for food, if they have some time to come to grips about it and that there is CONVERSATION about it. The guillotine approach (ie, not involving the child in any manner of choice or conversation) might work for a select few kids, but I think most kids would be traumatized. Sounds like you are already doing such a good job with your daughter, just keep doing it!