Sorry--- you do not get the child tax credit for a child who will be older than 17 at the end of 2021. She will be 18 before the year ends. You will still be able to claim her as a dependent on your 2021 tax return and you will get the $500 credit for other dependents.
https://ttlc.intuit.com/questions/1900923-what-is-the-child-tax-credit
https://www.irs.gov/help/ita/does-my-childdependent-qualify-for-the-child-tax-credit-or-the-credit-f...
https://www.irs.gov/credits-deductions/2021-child-tax-credit-and-advance-child-tax-credit-payments-t...
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