The strangest person that I have ever met

I was in 7th grade and I met a really strange girl in school. She seems elder than me and her appearance was also really weird. She was quiet, shy, and introvert. She didn’t make friends with any of us. Sometimes I and my classmates used to have a little party in our class after mids or Eid. We used to sing and crack jokes but she didn’t use to participate in anything. She was also not good at studies and was used to punish almost in every lecture and every day for not doing her homework and for not responding much to the teachers in the class. One day during our break time she came to me and said that she wants my help in her studies and said that she wants to study with me after school. I said ok to her and invite her to my house for studying. In the beginning, She was really cool and nice to me and she said that she wants to be my friend. I didn’t like her much but also I didn’t want to break her heart so I said Ok to her. Sometimes she used to do some weird stuff like one day she tore one of my books and reacted so normal and sometimes she spilled colors on the study tables. And sometimes she just slaps me for no reason and laughed loudly at this. I didn’t mind this because I know that she was not trying to hurt me she was just doing it for fun. After some days my mother prohibited her from coming into our house for doing such weird stuff. She was really clingy. In our classroom, she never left me for a second. Everyone in our class and even my teachers were noticing her sudden weird behavior towards me. She always tries to hurt me by spreading rumors and weird stuff about me. Whenever I got absent she lies about me that I got a serious accident and I was unable to come to school. And the next day she just said sorry to make everything normal. She used to backbite about me just to degrade me in my friends. It seems that she hated me and wanted to take my place in my friends. She hated me for being appreciated in any way. She had given me a kind of mental stress and I was unable to focus on my studies and my grades were affected really badly that year. Then my mother took an action and decided to talk to her parents but she came to know that her parents got separated a few years back and now she is living with her aunt. Her aunt told us that she was a mentally disturbed person and she had attempted suicide twice in the past as well and she was also admitted to the hospital for some time but she didn’t recover. And then my family finally decided to change my school to get rid of her.