One quick note: as the Hitchhiker's Guide to the Galaxy states: Don't Panic. While each of the non-RS states will first base their tax calculations on your daughter's total income as if she were a full time resident, their tax is prorated essentially by the fraction of the income that was earned in that state. And, as Hal_Al notes, the taxes paid to the non-RS states are used to compute a credit on the RS return for taxes paid to other states. Finally, it is very likely that even if a non-RS return is not required, your daughter will still want to do so to claim any refund due her.
(One thing to be thankful for is that you do not mention any non-wage income such as from investments. That could have created a new layer of complexity with the so-called Kiddie Tax.)
