Go by the actual 1040X. Line 18 should be any original refund amount and line 22 should be your additional refund. If you paid on your original return it will be on line 16. If there is an amount owed with the amendment, it will be on line 20.
Or what did you file originally? Did you file your own 1040? As Joint or Separate? If you filed Joint you should add her info to your return.
