Your daughter will continue to receive a 1098-E every year in most cases. If she meets the requirements that Mike9241 listed she will be able to deduct the interest that she paid, up to the maximum deduction of $2,500, whether or not she actually gets a 1098-E.
The student loan interest deduction phases out at certain income levels. If your daughter (or her spouse, if she marries) starts earning high income, the deduction might be reduced or eliminated. The income limits are adjusted for inflation each year. (The $2,500 maximum deduction is fixed and does not get adjusted for inflation.)
