I'm sorry that you have lost a friend to a church with radical teachings. Years ago my son got involved in a church that had a lot of Lunatic fringe teachings. This had a very negative impact on our relationship and put, my then a baby, granddaughter at risk. One of their teaching condoned VERY harsh control of your children. They would say unless you can see bruises you are not getting the devil out. I was very troubled so I turned to the Bible to find the reason not to be abusive. The Minister would use the Bible out of context to spread his perverted views. i was fortunate that I did get the help I needed from the Bible that turned him around.

In your friends case I don't know if this approach will work since it appears this church offers her the comfort she now needs. In my case there was a very fragile innocent life at stake. I could not wait for sanity to return because by then the damage would be done. Pray for your friend and maybe some day she will see the error in pushing her friends away.