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@63princess wrote:

But per the test she was 23 for at least 5 months.  


She had to be under the age of 24 on 12/31/2021 to be eligible to be claimed as a dependent under the Qualifying Child rules where her income is not used as a requirement, only if she provided over one-half of her own support.  Since she is age 24 or older in 2021 then she can only be claimed as a dependent under the Qualifying Relative rules which have an income requirement of less than $4,300.