@Richard30 wrote: "need wife's agi for yr 2018"
It depends on the 2018 filing status.
If you and your wife filed a joint return for 2018, then you both have the same total 2018 AGI and would each use the same total figure. Do not divide it or otherwise allocate it.
Or did the two of you file married separate returns for 2018, and are you trying to locate her 2018 return? If so, was it prepared in Online TurboTax or the desktop software (CD/download)?
Or were you not yet married in 2018, and the wife filed a return as single?