Why do you think she doesn't travel anywhere else but this one place?

My aunt travels from here in the States to Vietnam every year. Money is not a problem for her, so she spends usually 4 months in Vietnam, reuniting with her relatives and old friends (I still have family over there). Thing is, in these 4 months that she spends annually in Vietnam, she could easily travel to Japan, Thailand, and other Asian countries, but she doesn't. This woman doesn't have to worry about working or making money. She can easily afford a trip to Japan, and yet she spends 4 months straight in Vietnam every time. I know VN is her birth place and she loves it, but four months is more than enough time to explore a new place.
Why do you think she doesn't travel anywhere else but this one place?
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