I don't know...never tried to make it...have you???
Sorry, she doesn't impress me as being that smart...a sociopath, Yes....but smarts...NO.
Supposedly, it is not that hard to make, but she would have to have the time to make it and be assured her parents would not come home. I can't see her making it anywhere else. I also know that she is lazy. She would have to buy the products, make it and store it. It only stores for about a week from what I understand, so did she make it more than once, many times??? Where did she store it, in her bedroom, the shed???