One instruction is to contact the embassy that processed the visa, though it doesn’t really say what happens there. The only thing is if she has already arrived and her info is in the system, you may not need to provide a physical passport to adjust status at this point. I didn’t go through that process so I may be wrong-but they already have it digitally and you have pictures of it. The green card doesn’t depend on a physical passport. From there, options don’t look super convenient -cross to Mexico by land and get a new passport at an embassy there as she can cross back with a green card alone (by land, not air). Or wait three years and apply for citizenship and get a US passport. That’s assuming contacting the embassy that did her visa won’t help.