If you did not add your ex-spouse as a derivative beneficiary to your I-140 and I-485, then she cannot file her I-485 as a derivative beneficiary.
After the grant of your Green Card, her I-485 can be only filed with I-130 petition which requires your signature. Additionally, since you are a green card holder and not a US citizen, she cannot concurrently file I-485 with I-130 due to the visa unavailability.
The only way for you to verify whether she was added as a derivative beneficiary to your I-485 Application is to call USCIS using the phone number at the bottom of your I-485 receipt, provide your receipt number to the officer and express your concern.
Disclaimer: The information on this site is general in nature and under no circumstances it should be construed as legal advice. The information on this site should not be viewed as an engagement of Law Offices of Alla V. Londres L.L.C. nor an establishment of an attorney-client relationship. Since the information is current when posted on this site, Law Offices of Alla V. Londres L.L.C. is not responsible for any outdated information.