My daughter just received, another W-2 from one of her employers. Her Federal and state taxes have already been filed and excepted. Can I still amend her tax returns?

To account for this

    If your daughter's return is rejected, you can correct it and resubmit it.
    If your daughter's return is accepted you will need to file an amended return (after she receives her original refund.) See this TurboTax site on how to amend:  https://ttlc.intuit.com/questions/1894381