There is no element of choice. If your child CAN be claimed then she has to say on her own return that she can be claimed. At 18---she CAN be claimed. When you claim a dependent you get the $500 credit for other dependents and for 2020 you get the $1400 stimulus amount for claiming a dependent. And...if she was a student you get to claim education credits.
If she had tax withheld from her checks then she would want to file a tax return in order to get a refund.
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