I was accused of stealing a shirt from this girls locked locker thats been missing for 2 years?

[Katrina]

This girl accuses me of stealing this damn 5 dollar shirt and never confronts me about it. I hear her SCREAMING IT as loud as she can my first and last name and that i was wearing her shirt and i stole it throughout the halls. I have to hear about it from a friend and im in ROTC in my high school and my instructor also thinks i stole it but doesn't believe me and won't hear my side(shes rich and her parents donate to the program so he never even heard my side just said he "Knew" i stole it). this girl never has to the nerve to come up to me directly and say anything and now theres rumors i stole her bag, shoes, and award!!!!!!!! I didnt steal her 5 dollar shirt so she can calm down shes already posted it on twitter and im just embarrassed she would accuse me. I haven't had a class with her in 3 years and never talk to her or her friends. All my friends know i didnt do it so its great. The next day i go to give her the shirt so i can just stop the drama and she has her little friends listening in and snickering and i say a few words about how she shouldn't be accusing me of this and that she should of come directly to me if she had a problem and she shouldn't be spreading rumors that aren't true. You would think this shirt had gold incrusted leaves and diamonds in it but its a T shirt i wore for a night gown. Any way do u think i should've made a scene? got my parents involved or the administrates?