Can I amend my tax return once accepted and refunded? I forgot to include my daughter's (minor) 1099-NEC paid summer internship.

[Critter-3]

You do NOT put your dependent's income on your return which is why you were not prompted to do so.  The dependent must file their own return.  

Use one of  the IRS Free File programs  for the dependent so you don't need to pay the TT fee for the Self Employed program the 1099-NEC requires :        

Free File: Do your Federal Taxes for Free | Internal Revenue Service

[DanaB27]

You don't have to enter your daughter's 1099-NEC on your return. You only report your own income.

Your dependent might need to file her own income tax return. Please see Do I need to file my own taxes if I'm a dependent?

If I misunderstood and the 1099-NEC is your income and your return has been accepted then you have to file an amended return (1040X) to make changes. Please be aware that you can e-file your 2022 amended federal tax return, but states may require amendments to be printed and filed by mail. Please see How to amend a tax return for instructions.

Please see Where's My Amended Return? to check the status of your amended return.