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From what I remember, her father's DoB, full name and last four of SSN. I think I read that you can get around the SSN somehow by calling them.
Before you apply, I would pull her reports(whichever NFCU typically pulls) and making sure the AU cards(Some take forever to show up) are reporting and if possible get a FICO score so you know if it is worth HP. I'm not sure how conservative NFCU is.