There is no way to reconstruct the contributions other than from your own records, or the records of the Roth trustee. The IRS maintains electronic records going back 10 years. Your daughter could use the “get transcript“ function on the IRS website to look for electronic transcripts of form 5498 from the IRA custodian. (Form 5498 is how the custodian documents IRA contributions.) But since the IRS records only go back 10 years, we can’t help you reconstruct further if you did not save the records, and if Fidelity can’t help you.
If audited, the IRS will only allow your daughter a contribution basis equal to what she can prove with reliable records.
