An individual is permitted to make a QCD from the inherited IRA only if that individual for whom the IRA is maintained, your spouse as beneficiary in this case, is age 70½ or over. The age of the decedent does not matter with respect to this.
Since your spouse has not reached age 70½ or over in 2019, 2019 TurboTax will not offer to treat the distribution as a QCD (because it does not qualify as a QCD). You'll have to claim the charitable contribution as an itemized deduction on Schedule A instead.
