There is no form to file for this issue.
If your ex filed a tax return with you daughter as a dependent before you filed then you will have to print and mail your tax return including your daughter as a dependent. The IRS will pay you any federal tax refund shown on your return.
Within a year the IRS will contact you both to investigate this issue. The loser of the investigation will have to pay back any refund along with paying penalties and interest.
See this TurboTax support FAQ for printing a tax return using the online editions - https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online/00/26258