My sister is developed more than the other girls in her grade. The girls make fun of her and call her names. The boys won't stop staring. Now, she won't go to a public place without me. She's afraid to go to school. But, since I'm in a higher grade than her I can't help her. What do I do? PLZ HELP!!!

This is a tough situation make her comfortable with her self and if possible she should wear clothes that dont expose her much potentially wearing sweaters if the boys keep looking. Sadly bullying is still a thing and in my experience a kid who reports things and is getting bullied usually turns into more bullying. Boost her confidence up and sure its good that she relies on you as an older sibling but make sure she knows not only how to fend her self but be confident as a individual. She has got to make friends that defend her and it will create a barrier that dampens the making fun of situation.

Explanation:

Oh geez, that sounds rough. What grade are you guys in? It doesn't sound like much, but I'd try to explain to her that she has nothing to be ashamed of and that's on everyone else if they stare. It's not her fault that she's more developed. Perhaps you could go to the principal or a counselor about this? Or even a teacher?

I'm sure you could get a lot of them in trouble if you'd wish.

I'd try to explain to her that those girls who make fun of her are just jealous and it's best if she tries her hardest to ignore it.