FYI, you don't need to be a Filipino to get my point or so I can get yours. What if the principal ban only the Mexican language? She's probably going to get the same treatment like the one she's in now. American school doesn't require any one to speak only one language though of course when you're participating during class you're required to respond in english but with your peers after class it's just a courtesy if they can't understand you. If there are only 2 or 3 Filipino students there even if they speak tagalog all time they wouldn't care about it. If you're a Filipino & can speak tagalog I doubt you would only speak in english especially when you're with your Filipino peers same with Mexicans or any nationality whose bilingual.