The IRS only looks at the first 4 letters of the LAST name, the SS# and the year of birth ... if you were rejected for one of those a different rejection number would be presented. If you filed a joint return last year then you have the SAME AGI number. If you did not file jointly then you need to enter the number on the filed form 1040 for each of you... not from a 1040NR or a late filed return. If she mailed in the return after June last year then try using a zero for the AGI. If she filed a non filer return just to get the stimulus payment then use $1. If all else fails then all you can do is mail in the return.
