maybe and I'm only guessing, she realized the bullshit she was being taught at that school? The bullshit peer pressure being in such a school, how to get the top you gotta tread on other people. The drugs helped her escape that pain. because it is pain, it's horrible when see how cruel the mob is,the mentality they have, the hypocrisy.
I doubt that - she was very much one of them. She thought it was 'cool' at the time. Sadly, a few of her friends ended up the same way.