Do older single Japanese women need to date foreigners to get married?

I know a Japanese woman who is 37 years old and very aggressively pursues younger (20s) foreign/white/gaijin men in Tokyo. I doubt she is truthful about her age but the wear is starting to show since she's been in the party/hostess scene since her teens. What are her chances of getting married? Is she into foreigners because it is believed they are more liberal and accepting than Japanese men? Also she is already divorced, having married a foreigner who was 10 years younger than her when she was 28 for a visa. YES he was 18!