I have read most of your posts and I am sure that you mentioned this already as not being a possibility but your daughter's symptoms are a red flag to me since I have two sons with hereditary neuropathy. Is there any possibility that you have CMT? Does anyone in your family have PN?
Even if they developed symptoms when they were much older does not rule it out. It acts differently in every case and symptoms can show up in young children.
Was your EMG/NCS normal?