We have an intern volunteering with us in Mexico, traveling on a New Zealand passport. She arrived in Mexico (via LAX) in mid-June, with plans on returning to NZ (via LAX) in mid-Sept, which meant she could travel through the US each end, and on a couple of sight-seeing trips in between, within the 90 days allowed on the Visa Waiver Program.
She would now like to stay for a further 2-3 months, looking at returning to NZ in November or early December.
Now she is staying with us in Mexico, and has only been in the US a total of 4 days in the almost 2 months she's been here, but under VWP the clock keeps running, correct? She has a 4-5 day trip to Las Vegas booked before her (original) flight back to NZ, but now would like to return to Mexico after that trip.
What are her options for extending her trip, where she is primarily staying in Mexico, without breaching the VWP 90 day rules?
Note : she has entered Mexico via the land border so there is no record of her departure from the US to Mexico.