You will have to print and mail your tax return to include your daughter as a dependent. Since the IRS has already received a tax return with her Social Security number you cannot e-file your return. The amended return will not change the e-file status of her original tax return.
See this TurboTax support FAQ for how to print and mail a tax return when using the online editions - https://ttlc.intuit.com/turbotax-support/en-us/help-article/printers-printing/print-mail-return-turb...
