It's a story that would be roughly the same if the BF was Indian too. I think it's funny how Eastern traditionalism is not always susceptible to appeals based on Western progressivism. That's because traditionalism was often based on "whatever worked"; perhaps they couldn't explain the psychological impacts that having casual sex with 80 partners before marriage had on the woman or the quality of her marriage (although they do now). But they saw its effects and believed in it. Outside of the mother-daughter context, in an advanced educated society, Eastern traditionalists will need to do better job at explaining the 'why' of their beliefs- and they should; there's a lot of merit to their perspectives which are underplayed in the modern West. When you dig beneath, a great deal of science validates traditionalist ideas about human nature, about relationships, about gender differentiation, about how 'restriction' and deferring gratification leads to happiness more so than indulging your whims. There is a lot I hope Asia can do to civilize the West before it plunges totally into degeneracy.

Now coming back to the story (sorry), too little to the story, but I doubt the mother is trying to force her Western daughter into celibacy before marriage; she is more likely using that ideal as a counter-balance to the Western model of the complete opposite.

I find it interesting that how in the US, when an Asian woman has a problem with her father, the answer is to find another race of guy to date. Lot of people have problems with their parents, including their opposite-gender parent. AF Daddy Issues -> pigchasing? Chris Rock told fathers they had one goal with their daughter "keep them off the stripper pole". That daughters would 'punish' their fathers for mistreating them by doing what would harm them most (that their own daughter would be stripping naked in some sleazy strip club). AFs probably on some subconscious level know that flushing their genetics down the toilet by dating some unsuccessful, doughy mediocrity would be more of a "take that!" to their Dad than anything else.