This girl wrote bad things about me on Twitter?

[Jordan]

http://ca.answers.yahoo.com/question/ind...536AAWX0I5
So, this is my background of her......please read.
So, basically what happened was that I had to correct her test, and she recieved an "F" on it. I wrote some comments such as "messy handwriting" or "bigger drawings" or whatnot. This was a month ago.
I found out today that she had apparently written about it on Twitter.
I decided to look it up and I found them. She wrote like five tweets about it; she was calling me "Bitch" and posted some pictures of her test and saying she wanted to fight me and that she was going to look me up on Twitter and "tag" me (I actually don't have a Twitter).
My school is against bullying, I'm not sure what the policies state, but I can print these tweets out and give them to the office.
What should I do about this?

[Pearl L]

print them out and give them to the office