Cyberbullying

Hi there!
My daughter has experienced for the first time, cyberbullying as a threat was made to her to get beat up afterschool. I had set up an msn for her to chat with her friends but now I know it was a mistake because she is too young and the things kids talk about is unreal. So, I'm thinkning about taking her account off or just changing her password so she won't be able to log on anymore. My daughter is 9 and it has affected her at school, being scared of that girl and always keeping a watchful eye of someone sneaking up to her and gettin hit, that's what she had told me. I called the principal and let him know as my daughter had not told anyone because she is scared. So, to me, letting children cyber this young is not good for them and should wait a litlle longer to start cybering.