As others said, MLMs use tactics similar to cults for recruiting, and the same emotions get involved. Belonging, answers to difficult questions, and - to begin with - positivity at a negative time (before the 'you're not trying hard enough if you're failing' and control begins). Research gives strong evidence that emotional vulnerability and desires for ideals/positivity are factors, but nothing to do with intelligence, even when looking at those who end up in multiple cults. If information being available was enough, there wouldn't be an obesity epidemic or people who fall into shitty relationships. This is just a shitty relationship with the recruiter and company involved.
There is a lot of writing out there on helping people at risk of cults, and most of the research is counterintuitive to how most want to go. The time for articles on how shite they are is after they come out - relief and firming the position as people can be wobbly for a while and at risk of ending up in another 'solution'. At this point it's more likely to cause defensiveness similar to a teen falling in love and will fit very nicely into many recruiter's rhetoric that others just don't know/are jealous.
The important thing is maintaining a connection, keep them talking, and discussing any positives in a more general way - if she seems happier, talk about how it's great to see her moving her life in a happier direction. Dig into why this specific one makes her feel good and a place she belongs, ask questions about plans, ask innocent awkward questions like how much the person recruiter is making in profit, about writing a business plan and places to have it looked at, about looking into the kind of records banks want for mortgages like that. Be an alternative source of positivity and understanding that these groups give in heaps at the start.
Even the brightest can have an emotional crisis that leads to falling for someone else's answers to the problems. That's what MLMs are, just wrapped up in 'empowerment' and 'girl boss' (ugh). So, you wouldn't be U to feel like she's being brainwashed, but it would be U to call her insane if you want to start reverse the process.
Whether you want to do that is up to you, I don't think anyone should feel obligated to do that, but recommend either unfollowing as that train wreck isn't good to watch but you may want to be around when she comes out or have a google of talking people at risk of cults. Much of it can be applied here.