She does not have to file, but she should to get back her $700. She should be able to use Free Edition, claim her W-2 and get a refund of everything in Box 2. She doesn't owe any taxes (I am assuming the $6500 was income on a W-2 and she had no other income), so that $700 that was withheld is hers and the only way to get it is to file a 2021 tax return. Just be sure she marks the boxes that say someone else can and will claim me for 2021.
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