@user17759303457 you have the option of each filing Separate or Filing Joint in Illinios since you both were not full year residents.
if you choose to file file MFS , you would file MFS, with a residential tax return. Your spouse would file MFS with a part year tax return.
Alternatively, you can file MFJ and then take a tax credit for what your wife paid in the other state.
https://tax.illinois.gov/individuals/jointfilingdifferentstate.html
