You created her as one of a sequence of sibs, so perhaps you typed the name wrong and she's really Marge. Are there any missing?
You've got duplicates of the parents, so you'll need to merge them to collect all the kids in one place.
If there's a child too many, I'd just merge her into one of the others. If you detach her, she'll just be a blank profile, because there's no other information.