Well, you have three options:
1) She can begin working again and show income of around $20,000 or more per year.
2) You can use 1/3 the value of any asset that you own to meet the requirement (so you would have to sell the warehouse and transfer the money to a U.S. bank account). Or of course if she has equity in a house of over $60,000, that would work as well.
3) She can look for a Joint Sponsor for the financial aspect of the case. This sponsor must also file the same Affidavit of Support that she does and submit the same evidence that she still has to submit. The Joint Sponsor can be any U.S. Citizen or U.S. Lawful Permanent Resident that is over the age of 18 that makes the minimum amount. It does not have to be a family member or a household member.
So there are options available. Please let me know if you have additional questions and please do not forget to rate my service to you (not the state of the law) as that is the only way that I can get credit for my assistance.
Even after you rate the service, I can still answer additional questions for you without additional charge.
If you do rate me positively, a bonus is always appreciated. If you would like to request me in the future, just go to http://www.justanswer.com/law/expert-guillermosenmartin/