Kids? -- maybe... Adults? [18 both] indeed they are. But, the genesis of this woman's conditions still rest with her parents' discernments. This goes beyond the simple implications of relegation or, say, things legal. Second to that aspect, the family itself may still be under certain requisites by the Immigration and Customs Enforcement as well as the US Department of State, since they are from Kosovo. The parents are understandably pensive and have to be presently. Third, her male friend may himself have concerns as a Hispanic male, whose parents themselves may be on tentative terms with American immigration policies. You have to look broadly at this all.
You are best to simply mind your own affairs, though you would prefer to step in, which in truth is an interference on many planes. No family could expect to be part of a culture so new as that of the USA, a country what is to them so foreign, to take on the qualities of the USA so abruptly and not expect certain inconsistencies to ensue and glitches to occur. We can suppose that if you were to emigrate to Kosovo and had children, you would be as discriminating of what you allow your child to engage as they are here, being of the American nationality but now residing in Albania.
There is nothing wroing with following one's heart, as you say, but one is as well wise to abide all the attributes that make up the life of an individual at large. And let us not misunderstand what the Heart truly is...
Your two friends' equation is sophisticated enough -- hers, her guy friend's, and her parents' concerns -- that you must not add an extra variable in the equation as another outside source. The woman's parents may or may not have any unsually special aversions to her daughter's Hispanic male friend as much as simply have justifiable fear of the unknown that is the USA.
But this all is for those two to figure out, not you. It's easy to you, and may appear simple because apparently your breeding has been one of American all the while as perhaps were your parents' and your grandparents' and great-grandparents'. These Albanians histories, conversely, are but of a few years and must be allowed their own evolutions and acclimations ethnically and individually, as have all peoples who have come to this country by "choice," even if in this case as Albanians theirs been prompted by duress in their native land. That should be sufficient reason in itself to allow them their space for now.
Your two friends must work out their impasses with the parents by themselves.
