When you received your refunds, you can amend your 2020 income tax returns and delete your daughter as dependent.
Your daughter may file as individual to claim her refund, if any, and recovery credit, if qualified, but she can't e-file her income return. Both of the returns, your (1040X form) and daughter's 1040 form, must be mailed to the IRS. You may have to amend your state income tax, and your daughter has to mail her state income tax as well..
