bully gets others to come at me

So this girl keeps bullying me and she tries to get the whole class to join, it's gotten to the point where kids in the hall would stare me down as I walk by, and talk about me. It started because she was bullying my friend so I stood up for her and asked one of her friends why she always wants to fight. My 'friend' said she's right for what she's doing bc I'm talking shit about her and I was thinking "so it's ok for her to throw things at me, to take pics of me in class, to stand next to me mocking me, to get the class to join in, to tell me to fight her even though she's almost 2 years older then me and taller and bigger then me? No, just no, it's wrong. COMPLETELY worng COMPLETELY ignorant and COMPLETELY being a bully." 2 boys in the class even admitted to trying to get me mad so I can fight her but instead she came up to me and started mocking me saying "what now you're becoming mute?" Also we have state testing this whole week and at 7:20 am she was telling me to 'come at her' and since I didn't she said 'yea that's what I thought' even my 'friend' told her not to throw the first punch and let me do it. Just to say I'm not gonna fight her I told her she's irrelevant but she keeps coming at me. I told guidance today and they said there might be an investigation so I told them "no there's no might be investigatation, it's gonna be investigated" and even my parents say their gonna call the school about it. If ANYONE can help me, that'll be great 👍