She is NOT the 'son or daughter' of a PRESIDENT. She is the NIECE of a president. I trust you get the difference.
But she'd not the son or daughter of a president (yet). She's the neice of a president. She's also the granddaughter of a president. She also the daughter of a governor. The story (from yesterday) is a "breaking news item" today.
The headline she generated is that she is the neice of somebody famous. Certainly is peculiar given that her dad is a bigger influence in her life (but then the story just isn't as big).