Whyy so much hatred

It has always been really difficult for me to comprehend that why there are some people who hate you for no reason. Like they invest so much energy in ruining your things, life in general. I have this classmate, I never interacted with her, we are two completely different people, our goals, our aspirations, our professions we happened to just take some classes together. Shes much much younger than me. Theres no concept of us being peers or any professional envy. But she always make sure to hurt me I dont know why she hates me that much. I have dealt with her with kindness, strictness, ignored her yet she wont budge. Shes goes out of the way to delay my work, hide my documents, submissionss, misscommunicate. Unfortunately I have to deal with her shit show all the time and its just too much for me I prefer to live a simple life but she comes and creates drama for no reason. I just dont want anything to do with her. Shes getting on my nerves. Shes annoying. I wish she invest this much energy in improving her own life rather than creating problems for me. I wish she becomes so happy in her life that she forgets about me. I wish she just disappears from my life.