我妈年初B2来美后又回国。现在又以B2来。机场的移民官口头告诉她这次只能呆两个星期，可是她护照上的章和网上的I-94都显示给了她六个月居留期。
我在美国官方博客（http://blogs.usembassy.gov/philippines/?p=1998）上看到居留期（admitted-until date)是以护照上的章为准：
“The length of stay in the U.S. is determined by a Department of Homeland Security (DHS) Immigration Officer. At the port-of-entry, usually an airport, an immigration officer will determine whether or not you will be allowed to enter the U.S. and for how long. The officer will also provide a stamp and will record either an admitted-until date or duration of status (D/S). This notation is the official record of how long you may lawfully stay in the United States.”
请问我们应该以哪个为准：移民官口头告诉的两个星期，还是护照上的章和I-94？ 如果是以护照上的章的话，我们就有时间给她申请绿卡了。
谢谢！