You cannot get the child tax credit. The CTC is only for children under the age of 17 with NO exceptions. If you are claiming her as a qualifying relative you get the $500 credit for other dependents.
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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