Detroit City Taxes

My daughter wasn't able to receive her 2021 W2 by mail because her W2 has the incorrect address.  Per the incorrect address City of Detroit taxes were withheld.  My daughter worked in the City of Romulus where there is no city tax, and she lives outside of Detroit and should not have had Detroit taxes withheld.  She received a W2c form to correct the address error.  What is it that she needs to do to have the City of Detroit taxes refunded to her since they should not be withheld from her earnings?