@bigpoppacg4204.c - one more time - and it is consistent with all the other advice
1) you only have two choices: File Joint (which requires her agreement to sign the tax return) or File Separate (of she won't agreeto sign - which is her right)
2) if you file Separate, you don't care that someone else claims her - that is her issue (and an issue for whomever claims her fraudulently); you are not "claiming" nor deducting anything related to her. Each of you is filing their own separate tax returns.
3) if you file joint and are still concerned that someone else may attempt to claim her (or you for that matter)....then the PIN that I suggested above is the way to go. THat is the purpose of the PIN - to mitigate identity theft
