My dependent (my daughter) was given a 1099-NEC for working at a snowball stand. How do I add this?

MY DEPENDENT HAD A JOB

If your dependent has a W-2 for his after-school job, summer job, etc. you do not include the information on your own return. You can still claim your child as a dependent on your own return.  He/she can file his own return for a refund of some of his withheld wages (he won’t get back anything for Social Security or Medicare), but MUST indicate on it that he can be claimed as a dependent on someone else’s return.  (Supervise this closely or prepare it for him!)

If your dependent’s earnings were over $400 and were reported on a 1099Misc or 1099NEC then he must file a return and pay self-employment tax for Social Security and Medicare.

You might also want to use free software from the IRS Free File versions:

https://apps.irs.gov/app/freeFile/

You cannot add your daughter's Form 1099-NEC income to your tax return.  Instead, she may be required to file her own return to report the income reported to her on Form 1099-NEC.

The income shown on 1099-NEC implies that she was treated as an independent contractor by the snowball stand and not their employee.  If she made at least $400 net (income minus any expenses she incurred), then she must file a return including Schedule C to report the income and possibly be subject to self-employment tax.  

See the following TurboTax article for further details about filing requirements for a dependent:

Do I need to file my own taxes if I'm a dependent?