What do you want to happen? The net-net is that you can’t “stick it” to your ex, without sacrificing your daughter as collateral damage. Is it really going to be worth it to you?
Keep in mind that your Daughter also signs the FAFSA where she attest the information is true.
** Do not even think** about doing this after she graduates, because willful misrepresentation (even on financial aid forms ) would be grounds for having her degree rescinded, leaving her with a worthless piece of paper and being a non-grad).