Do I need to file in both NC and SC

We live in NC and my daughter (an NC resident) is going to school in SC.  She made a small amount of money ($5K) in SC working at the school and they withheld about $90 in State taxes, and no Federal withholding.  Her total AGI is only ~$6k. Other income is from int and div.  No other income or deductions.  Do I have to file in NC and SC along with Fed just to get back the $90 SC state withholding?  By the time I buy the extra state in TT and pay for electronic filing for all of them, it will cost more than the $90 refund.  Can I just not file any taxes at all for her? Also, she is part of our ACA subsidy so I think I have to show her $6K AGI as part of our MAGI when we file.  Is that the case even if I decide not to file any taxes for her?