If the $10,000 is earned income on W-2 , she does not need to file. On the other hand she may get a refund of the amount in box 2 of her W2 form if she does file a return.
If part of her income is on Form 1099-NEC or 1099-MISC, she will need to file and may owe some tax.
If she does file a return, she needs to check the box, "Someone can claim me as a dependent".
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