My friend is a sociopath

So my friend tends to get into trouble but always seems to lie and manipulate to get out of it. I’m talking real trouble, criminal. She doesn’t look or seem like she would when u first meet her she is quite charming and attractive. She is on honours at school. I let things slide with her, however she’s been acting weird today and saying she was so bored she wanted to put lead nitrate, which she has access to, in one of the juice bottles in the cafeteria at school, she’s in 11th grade btw, this could harm someone. She then said she was just joking and started laughing. I’m worried she’ll actually hurt someone badly one day just to get an “adrenaline rush”. She is always chasing “euphoria” and fast emotions.