In the end she told me she doesn't care about what the organization does or has done, and that what's important is "God" and what the Bible says
This statement is key to understanding why she doesn't grasp or understand the fact that the GB are lying sinister hypocrites.
Simply speaking, due to the repetitive exposure to witness teachings, in her mind, God and the GB are the same entity. So when she is shown concrete proof that the GB lies, minsterprets, deceives, etc., because her mind only understands them to BE Jehovah God, it will automatically protect itself by going into a state of denial in order to protect itself by something (the truth) to hard to even contemplate. The harder you push the more defensive she will get up to the point of violence.
This is a very broad overview of the psychological condition many witnesses suffer from when they are confronted with the truth. When they experience this in field service, they just label people apostates and be done with it, onto to the next house. It's actually quite fascinating to see this happen.