Her overstay will already create issues with her eligibility for the visa waiver program, and if she stays more than 180 days it triggers a period of ineligibility if she leaves the country. We don't have the background facts relating to her entry, whether you were married before or after the time of her entry, or whether she might be accused of having entered with fraudulent intent based upon her overstay and the timing of her petitioning to adjust her status based upon the marriage. It would be sensible for her to discuss the details of her situation with an immigration lawyer.