I’m confused…
Her dad lives here but has not filed taxes in the last five years? Is that what you are saying? Does he work? Does he have income of any kind?
If he was not required to file a tax return, she would complete her FAFSA and indicate WILL NOT FILE for her dad. She would still need to complete the form listing his income and assets.
If he was not required to file taxes, contact the college and ask where their non-filers statement is. They should be able to get this to her.
BUT if dad was required to file taxes, he is going to need to reconcile this.
Are the parents divorced?