Fighting This Chick At Schooll?

Ok well im 13&&in seventh grade theres this girl who is scared of me but cant keep her mouth off me but the only thing shes dunn is write a myspace status she wont text me call me and she really wont say anything to my face she texted me once and i asked her if we could finish this after the bus and all she can say is if yu think im going to fight yu your crazy so im ready to run stright this ho so how should i do this and on the bus after or during school but my best friendss mom is close to her mom and we wont be able to hang out anymore and if i do it at school shes got back up so u tell me??????