Just had this discussion with my Wife! It is interesting because it is one of the rare occasions where I take a more literalist interpretation than WT.
The scriptures say "I will offer that one up as a burnt offering."
The context says that she was mourned. You don't mourn the living.
You can't object on the basis of Jehovah not liking human sacrifice... Abraham & Issac, anyone? Jesus? He clearly doesn't have any qualms about it.