cwaf

I found this website: My link
this part applies even though she is not yet a permanent resident:
"3. What are the legal ramifications when a U.S. citizen and a lawful permanent resident decide to get divorced?
Many U.S. citizens are very surprised to learn they are still financially liable to their spouses who obtained their immigrant status through marriage. When U.S. citizens marry foreign nationals, they commit to financially supporting their immigrant spouses by signing Form I 864, Affidavit of Support.
A divorce does not terminate that financial support obligation. Even when no longer married, the U.S. citizen remains financially liable for support, until the sponsored immigrant:
The sponsored spouse becomes a U.S. citizen;
The sponsored spouse is credited with 40 qualifying quarters of work in the United States. Although 40 qualifying quarters of work (credits) generally equate to ten years of work, in certain cases the work of a spouse or parent adds qualifying quarters. The Social Security Administration can provide information on how to count qualifying quarters (credits) of work;
The sponsored spouse becomes subject to removal, but applies for and obtains in removal proceedings a new grant of adjustment of status, based on a new affidavit of support, if one is required;
The sponsored spouse ceases to be a lawful permanent resident and departs the United States; or
The sponsored spouse dies.
In other words, the U.S. citizen spouse, even if divorced must provide any support necessary to maintain the immigrant spouse at an income that is at least 125 percent of the Federal Poverty Guidelines for their household size (100 percent if the U.S. citizen is on active duty in the U.S. Armed Forces). If the U.S. citizen does not provide sufficient support, the immigrant spouse may sue the U.S. citizen for this support.
If a federal, state or local agency, or a private agency provides any covered means-tested public benefit to the immigrant spouse, the agency may ask the U.S. citizen to reimburse the agency for the amount of the benefits it provided. (Means‑tested benefits include food stamps, Medicaid, Supplemental Security Income (SSI), Temporary Assistance for Needy Families (TANF) and the State Child Health Insurance Program (SCHIP).)
If the U.S. citizen does not make the reimbursement, the agency may sue the U.S. citizen for the amount that the agency believes it is owed. If the U.S. citizen is sued, and the court enters a judgment against the U.S. citizen, the person or agency that sued may use any legally permitted procedures for enforcing or collecting the judgment. The U.S. citizen may also be required to pay the costs of collection, including attorney fees"