Hello James, Your friend is very lucky to have you to confide her dark thoughts to, and if course you are rightly scared for her. There will be lots of distortions, memory gaps and things to make sense of. Agree with Christina concerning professional help. Often  active, reflective listening can in itself also be very helpful and supportive, especially alongside careful adjusted medication.Trusted professional input, if available, may help as well and share out your considerable burden in this area. In any case you must be sure to keep yourself strong, refreshed and healthy, so  that you can continue to support your friend and not 'burn out' in this difficult process, nor sucked in to the dark world she walks in just now. Believe the therapy I mentioned could be particularly important because of the long term abuse your friend has suffered.. there will likely be issues of poor self esteem and misplaced guilt and shame.Lots of things to work through. Good luck and keep posting if it helps! Chris retired doc UK has family member with untreated paranoid sz