How to tell a girl that I hate her and I wish she would get hit by a truck?

Before I met Samantha, I don't think I've ever truly experienced hate. I've disliked people, sure, but none of them make me feel like this. Her voice is nasally and makes me want to punch something. Her face is disgusting. She acts like a freak, making weird noises and hand puppets to herself. I could forgive all this and be nice to her, uming she's mental, but she's also so freaking mean. She snaps at people for no reason. She once tried to claw a kid's throat out. She shoves her work aside and pouts regularly. She's like a teachers pet, but even the teachers cant stand her. Yesterday she was behind me in line and I felt like I was going to vomit, the way she was breathing down my neck. I can say with no uncertainty that I despise her. She's a total snitch. With only a few more weeks of school, I want to know a way to tell her what I think of her. Maybe a cake with "I hope you die a painful death"? Perhaps an anonymous letter? Or just a quick "BTW, I can't stand you." as I'm leaving for the summer. Ideas? I know it's immature of me, but I cant take this anymore.