The correct answer is "She is unwilling to embrace any aspect of multiculturalism because she detests American culture."
The grandmother is not mainly concerned with the preservation of family’s Mexican culture because marrying someone outside of one's race or ethnic group does not necessarily mean that the family of the Mexican spouse will cease to be Mexican, only that it will not only be Mexican. American multiculturalism goes both ways, Americans accept the cultural differences of minority groups and minority groups embrace American culture and infuse it with their own cultural contributions. American multiculturalism is supposed to accept all cultures both the minority culture and the majority culture. Rejection of it goes against one of the basic tenets of multiculturalism: that all cultures are valuable and all are equally important.