Turbotax offers "free" filing based on the forms needed, not the income level of the taxpayer. If your daughter is a regular W-2 employee, she is not even required to file if her income is less than $15,000, unless she has more than $2600 of unearned income (investment income, prizes, gambling) and is under age 24.
If she is self-employed (her part-time job is Uber or something similar) then she is required to file and will not qualify to use Turbotax for free because of the need for a schedule C.
You could investigate other e-filing options.
