What is the cause of her intrusive thoughts she feels aren’t her own, her suicidal thoughts, and fears she is unsafe?

This is a spillover of the ongoing campaign of inner tormenting being mounted by the spirit meddlers within her, and this fits perfectly within the perception she holds that these thoughts are not truly her own, but drive her to emotional extremes that are disturbing for her and add to her fear about lack of safety. This is quite understandable given that there are savage demonic beings within her, terrorizing her with endless threats. She is feeling the effects secondarily, via her emotions and that is a blessing in one sense, that she is protected from the brunt of the attacks. But it leaves her with nowhere to go in not understanding the origin of her fears. They are literally threatening her and mocking her with predictions she will end up killing herself as her only escape, and she is sensing this intuitively and begins to worry about this very thing. If you think about this, it is a perfect tool for a psychological warfare campaign to undermine an opponent, and that is the purpose—to ramp up her fear to attract more energy for the meddlers instigating this reign of terror.