She will need to file a NY state return as a resident. She will also need to file an IL non-resident return and a MA non-resident return. Please read the TurboTax FAQ below.
IL Department of Revenue - Filing Requirements
A nonresident, you must file Form IL-1040 and Schedule NR if:
- you earned enough taxable income from Illinois sources to have a tax liability ( i.e., your Illinois base income from Schedule NR, Step 5, Line 46, is greater than your Illinois exemption allowance on Schedule NR, Step 5, Line 50), or
- you want a refund of any Illinois Income Tax withheld in error. You must attach a letter of explanation from your employer.
Commonwealth of Massachusetts - Who Must File a Massachusetts Personal Income Tax Return
If you're a nonresident with an annual Massachusetts gross income of more than either $8,000 or the prorated personal exemption, whichever is less, you must file a Massachusetts tax return.
You are an individual nonresident if you are neither a full-year or part-year resident.
Nonresidents use Form 1-NR/PY: Massachusetts Nonresident/Part-Year Tax Return.
Please see TurboTax FAQ: How do I file a nonresident state return?
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