I hate to see these threads...
I am the crazy chicken lady, my name states the truth! LOL!
I have NEVER had a bird I couldn't "re-train" or really, for that matter, had one that has misbehaved so badly I would ever consider getting rid of.
People say that there are mean birds and there is nothing you can do to deter that behavior, that some breeds are just "mean".
I believe from my experience that you can manipulate the behavior of the bird.
I have a small flock of 12, all kinds of breeds, and not one of my birds has ever attacked anyone......in the family that is...My roo's are like watch dogs, if a stranger comes in the yard, they will investigate and possibly chase, LOL!
My birds can all be picked up and handled, and are handled on a daily basis, have been since birth. Which could be why they are so tame.
I believe if you give this bird some one on one time, with your child present in sight, you can fix this behavior.
I have had my birds for a few years now and my daughter has always been able to go out and love on all of them without incident.
I hope things work out and you dont have to "replace" this hen. Good Luck.
Oh, P.S. If you look at my avatar thingy, you will see one of my hens (silver phoenix) laying on my daughters bed....if that gives you a clue as to how tame my birds are, LOL!