You lose the child tax credit in the year in which the child turns 17. Once they are older than 16, you get the $500 credit for other dependents instead of the child tax credit. If you claimed her as a dependent on a 2023 return, you should not have received the CTC. You should only have the credit for other dependents ---the one for $500 on line 19 of your 2023 Form 1040.
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