If her income is under $12,550 and she is not a dependent*, she is not required to file. However, if she has withholding, she would wish to get that back. If this is her only income and it's reported on a 1099-MISC, she need not file.
*Single dependents— You must file a return if any of the following apply.
1. Your unearned income was more than $1,100.
2. Your earned income was more than $12,550.
3. Your gross income was more than the larger of— a. $1,100, or b. Your earned income (up to $12,200) plus $350.
