I have family members and friends who are just like you described.
What would you do if your friend suddenly became a satanist? What would you do if they joined any cult or group detestable to you?
What if they took a spouse who you knew was a POS?
And dont tell me that stuff about, 'oh, she is educated and smart.' I worked with an engineer who thinks evolution is not true.
The bottom line is that if you can't respect your old friend, then break it off because it serves no noble purpose and it doesn't lift you or her or the friendship up.
If she wants to admit her sins, then you can consider forgiveness, it's up to you.
In my case, with my old family and friends, I did a lot of soul searching and realized that the relationship had died a long time ago, that is why I didn't see their cult fixation coming.