How do I get out of school tomorrow?

Okay, so I just found out that a girl in year ten has told people that she was going to beat me up (a year 7) because i angered her brother! She has a bad record and I know she will probably do what she intends to do!! So, I know I should tell my mum and dad about it but I don't want to because I know they will call the school and everything!! So I have 3 other options.. 1. Stay home from school 2. Hang out in a completely different spot to where I usually do or 3. Face her and get mangled!! :/ please I take full responsibility for my own actions, all help will be appreciated thanks