does my girlfriend need a passport to go to mexico if she has her green card in usa?

The US government only requires a green card holder to hold a green card when coming back to the country from Mexico or Canada. Your girlfriend from Laos has sufficient documentation to return to the States. She may wish to check with the Mexican Consulate or embassy as to whether further travel documentation is required for her travels in Mexico.Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.