No One Likes A Bully!

There's a girl who attends my school who likes to bully everyone all of the time. She even bullies me sometimes; ever since I was in the 2nd grade and I'm now in the 4th grade. She's very mean and always cussing, gossiping about others and makes people cry. The reason she doesn't get in trouble is because everyone seems to be scared of her and won't report her to the teachers. My friends and I said that we were going to start telling on her, because it has to stop! The times we have told on her, she lied and so she always gets away with it. I wonder why she can't just tell the truth, instead of lying? But most importantly, I wonder why does she feels like she has to bully people at all? I feel like people who bully other people aren't happy with themselves and they do it in order to take the attention away from whatever they have going on in their own lives. But in the end, they are only hurting themselves, because, NO ONE LIKES A BULLY!