My BJJ kids class....omg why do this to children?

This girl comes in today and wishes to try some Brazilian Jiu Jitsu. So what the hell. She is a young girl maybe 12 at the most. She weighs 208lbs. Can you belive that someone would let their child get that big at such a young age? If she doesn't do something and I mean soon, she will be obease when older. She is obease now let alone time for more eating and less exercise. I hope she comes back. I will be positive if it kills me. I would love to make a difference in someone's life. Maybe she was sent to me for guidence?? I hate parents that let their kids eat themselves to death.