Taxpayers are responsible for determining the amount of mortgage interest that is and is not deductible. You and your daughter should keep records showing when you acquired your mortgage, how you used the mortgage proceeds, and how you split the mortgage interest and real property taxes. In general, you should keep your records for at least three calendar years after the later of the return filing date or the return due date. See Publication 936, Home Mortgage Interest Deduction for further information and for rules on the amount of mortgage and home equity loan interest that you may deduct within a taxable year.
Usually the Form 1098 comes in only one social security number (SSA). Keep the records as indicated and split the amounts based on the amount each of you paid.
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