On your 2021 return put in the "Fake" SSN and be sure to select that it is "not valid for employment." That should make her ineligible for the Child Tax Credit but still eligible for the Other Dependent Credit. Then white out the social security number and mail in the return and W7.
Be sure to file for an extension separately to allow time for the ITIN to be issued before the filing deadline.
@zhifen
Edited [3/10/2022 5:15am PST]
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