Letter 6419 is about the child tax credit, not the stimulus payment. If you received a stimulus payment you will get letter 6475.
If your daughter CANNOT be claimed on a 2021 tax return then she can receive the EIP payment---also called the stimulus payment--- as a recovery rebate credit on her 2021 tax return. SHE did not receive it---you did. That is not the same thing.
But it is important to understand the rules----if she CAN be claimed then she has to say on her own return that she can be claimed as a dependent.
https://ttlc.intuit.com/community/dependents/help/when-do-i-have-to-answer-yes-to-being-claimed-as-a...
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