She can still petition for siblings over 21; it's called a "Fifth Preference" petition. Also, the "massive legal immigration crisis" is there, my friend. I've been a State Department visa officer -- in the Philippines, to boot! -- and I can tell you that we're committing a kind of national suicide thanks to our current immigration law.
Right, but its likely that her parents already did that before she was old enough to petition. You know they have their petitions filled out and ready to mail the day they rich the age of 21 when they can petition or when they have LPR status or have been naturalized...especially if their from the Philippines.
Any we have only our elected officials to thank for that. "INS" or the State Dept usually end up being whooping "persons". I am told that most if not all immigration offices have a staff of people to deal with congressmen who are looking our for their constituants, the un-Americans.
Good luck in the Philippines.