Nigger have you ever heard of the Iago procedure?
Its rather simple really.
Named after the Shakespearean villain in Othello whom while posing as the titular character's best friend slowly but subtly began sewing doubts about his new wife while seemingly defending her and her honor to him (i.e. "oh im sure there is an innocent explanation why she is hanging around with that sexy lieutenant of yours that isnt them fucking! totally sure!") and thus slowly driving him into homicidal rage at her apparent infidelity and eventually causing him to snap and kill both her and himself.
I would suggest you remain her friend and appear genuinely supportive and enthusiastic to her new dogma....but ever so subtly introduce her to the shit we see and laugh at every day, i.e. SJWs and Antifa and such acting like such absolute hypocritical and hateful and violent shitbags and come up with really dumb and patently nonsense defences for their idiocy. Be extra eager to talk about the latest woke celeb/media person who got outed as a creeper or sex offender and casually drop in the fact it seems to be happening to more and more self professed progressives, and openly ask her how those around them could not have seen what they were really like (or infact, if they did see what they were and kept it quiet)
In short, act as a poisonous adcovate for all things SJW, "Inadvertently" bring attention to the most obscene and fanatical and cynical and exposed-to-be-predator sections of the mob and offer intentionally feeble defences for it all. The main thing is to maintain trust, and never draw conclusions for them, merely lead them down the path and let them finish it on their own.