You don't add your daughter's income to your tax return, but your daughter may need to file her own tax return.
Click the following link to IRS.gov. to access an interview
tool to help you determine whether or not your daughter is required to file a tax
return: https://www.irs.gov/help/ita/do-i-need-to-file-a-tax-return
Generally, if your total income for the year doesn't exceed the
standard deduction plus one exemption and you aren't a dependent to another
taxpayer, then you don't need to file a federal tax return. The amount of
income that you can earn before you are required to file a tax return also
depends on the type of income, your age and your filing status.
