My ex bestfriend tried to kill me.

This has possible tw and i don't like trauma dumping this to anybody i know so u guys are the first ppl i am venting this too. So i was very close with person 1 year ago at school. I got to know that she had feelings for me when took a peek at her sketch book this one time (i swear this was by accident i just wanted to look at some cool art) but idk how to respond and stuff so i just let things be for the time being and she never confessed her feelings to me so i thought she wanted to keep it hidden. She did a lot of sh whenever she got upset and she clearly needed help from trustworthy adults, i wanted to help her in any way possible so i looked out for her triggers. This one day did not go well for her at home so she came to school with so many fresh scars and i practically teared up and begged her to tell me what was going on(now i wish i didn't). Basically she was r-worded by her cousin when she was 6 and she became traumatized and r-worded her sister(mind you her sister was in 2nd grade) .She did sh to cope with the guilt. Naturally i was shocked like i see her with her sis everyday when they come to school holding hands and she is so like tiny a literal fucking kid and that made me sick. Things were not same between us after that and i tried to distance myself from her and she noticed but she didn't say anything and had a blank expression on her face. Some weeks later our school hosted a science exhibition and seniors had to make stalls and props, i didn't bring lunch with me cos the teachers told us that they would be giving us food. Unfortunately I didn't get anything and she offered to share her packed lunch with me, i didn't think too much at the time but she had packed a separate tiffin which was weird. I didn't turn her down and started eating her lunch(fried rice). My mouth started bleeding after a few minutes and i noticed that i had bite down on something sharp, i spat out and it was freaking glass shards. There was small pieces of glass between the rice and all that time she was watching me eating the food, she then proceeded to ask me how the fucking fried rice was with a visible tiny smirk on her face. When i reached home i started vomiting nonstop and i was alone so i couldn't ask for help(i called my mom and she didn't take me seriously and told me to drink yoghurt water idk). Anyways i could not get out of bed for a whole fucking week and had an absolutely terrible fever that made me weak overall. Anyways i got out of school after the grade ended and before i left she made the gracious favour of trashing me all over the gchat calling me a slut and made it so fucking horrible for me to talk to my other mutual friends that i had to leave the group. I have no contact with anybody from the school over a year now so yeah.