Are you a U.S. Citizen or Permanent Resident (Green Card holder).
If not, how did you file the FAFSA? How did your parent(s) sign the FAFSA?
If your mother worked off the books and earned $9000, that is what you should have put on the FAFSA. Income, must be reported, whether or not it can be documented by a W2.
If you say that your family had no money, you will most likely be flagged for low income verification.