Since you filed 2022 as Joint then you enter the same AGI amount on both your separate returns. Yes you use the 2022 AGI on her return. If it rejects then try entering 0 for the AGI. If it still rejects it you will have to print and mail hers.
If it rejects for something else then post back. Hopefully you did both MFS returns right. What state are you in? If you are in a Community Property state it can be tricky to figure out. See,
https://ttlc.intuit.com/community/married/help/married-filing-separately-in-community-property-state...
May I ask why you want to file Married filing Separate? Unless you have a specific reason to file separate returns, It is usually better to file Joint. Joint has the lowest tax rates and the highest Standard Deduction.
Here's some things to consider about filing separately……
In the first place you each have to file a separate return, so that's two returns. And if you are using the Online version that means using 2 accounts and paying the fees twice.
Many people think they come out better when filing Married Filing Separate but they are probably doing it wrong. If one person itemizes deductions then the other one must itemize too, even if it's less than the standard deduction, even if it is ZERO!
And there are several credits you can't take when filing separately, like the
EITC Earned Income Tax Credit
Child Care Credit
Educational Deductions and Credits
And contributions to IRA and ROTH IRA are limited when you file MFS.
