If your 20 year old is not a full-time college student you cannot claim her as a dependent, because she had over $4300 of income. She can file her own return that says she cannot be claimed as someone else's dependent---and she can receive the $1400 stimulus by using the recovery rebate credit in Federal Review, and she may get a tax refund if tax was withheld from her paychecks.
Sorry-----you cannot claim her.
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