What do I do

This girl that doesn't go to the school anymore threatened to get me in trouble. She asked if I pushed her friend and if I'm talking bad about her friend. I told her I didn't mean to push her and she told me bullshit. It's the truth, my friend pushed me and I knocked into her. My friends bigger than me and when she pushed me I almost fell and I put out my hands so I won't then the other girl was there and I hit her. Since I'm small it's easy to push me. What do I do she said she'll tell the VP on me and its no fair because she was telling my friend not to talk to me.