You don't need to do anything. Your daughter deducts the mortgage interest she pays and keeps good records in case she's ever audited. There's an entry point for interest not on a 1098.
See this link on deductibility <a rel="nofollow" target="_blank" href="
https://turbotax.intuit.com/tax-tips/home-ownership/deducting-mortgage-interest-faqs/L4a9KF9mI#loans...> which includes this statement: "If the loan is not a secured debt on your home, it is considered a personal loan, and the interest you pay usually isn't deductible. Your home mortgage must be secured by your main home or a second home. "
