It says filing is optional because she does not have to file a tax return. Your daughter made under the threshold and did not have any taxes withheld.
Generally, single dependents must file a return if any of the following applies to their income:
- They have more than $1,100 of unearned income.
- They have earned income of more than $12,400.
She does not need to file a return since she does not meet the requirements and would not be getting a refund of taxes withheld.
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