She will NOT have to file a Virginia tax return because she is Single and her VAGI is less than $11,950 (filing threshold) and the employer did not withhold for for Virginia.
Because she is not a resident of DC and did not work in DC, you can use Form D-40B, Non-Resident Request for Refund D-40B (Fill-in) instead of filing a DC nonresident return to get the DC withholding back. She can also file a federal return to get the federal withholding.
I provided the DC form so you do not have to pay the TurboTax filing fees.
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