Is her father a citizen, and/or does he have a SSN? If no, there are instructions on how to fill out the FAFSA (print it off, sign a hard copy) for parents without a SSN. If he is a citizen or has a SSN, HE (not you or the student) can request a statement of non-filer through the IRS. He may not need to file if he doesn’t make enough money in the US so just because he hasn’t filed doesn’t mean the student can’t file a FAFSA or qualify for Pell grants and loans.