What should I do about my sister being involved in a pyramid scheme?

I just recently had a fight with my sister because I believe that she is involved in a pyramid scheme (or something legitimate enough to not be legally considered a pyramid scheme but still not on the up-and-up).

I recently found out that she was soliciting my friends about her ‘legitimate business opportunity’. This made me incredibly uncomfortable, and I told her to leave my friends out of it. She got incredibly offended and pushed me into explaining why I wouldn’t want them to ‘profit from a lucrative business’, to which I responded that I thought she was involved in a pyramid scheme.

I’ve tried checking out the business she’s affiliated with: L(eadership)T(eam)D(evelopment) Team (yes, the team bit is redundant, kind of like ATM machine), but you need a password to get on the site LTDteam.com and if you google “LTD team scam” or “LTD team scheme” you get a bunch of stuff about these people soliciting people in McDonald’s parking lots and the like.

I want to show her that this is not right, but she seems very cult-ish about the whole thing. I also don’t want to push her away. Should I not meddle in her life? Or should I try to convince her of her (in my eyes) error before she lands herself in even more debt?

Sorry this got so long, btw.