Having read the stories on EMF of how damaging the psychological effects of this cr*p are, it is so sad to know she may face the same fate, when in fact she was an amazing person to begin with and had a well-rounded and what was a grounded approach to life until she had the wool pulled over her eyes. Unfortunately, for my own peace of mind, I just have to forget about this whole scenario and move on with my life. I will always love her, but right now the only positive for me is that I had 6 beautiful years with her and I will always remember her and love her for the person she was.
As I said to her when trying to 'shake' her out of the madness...You are a highly intelligent person. Your mind can work equally as powerfully for you as it can against you. Therefore guard it fiercely, as it is far easier to keep it safe than it is to get it back once it's been taken from you.
Just want to let you know that I sympathize with what you must be going through. My mother became an RSE student more than 10 years ago, so I know what it feels like to have a loved one join RSE. For a while I joined RSE too, one of the reasons for that being that I thought that I would not loose her completely that way. Don't make the same mistake! My mother is a fervent ramster to this day and although we have kept in touch and she seems to have accepted that I'm no longer into RSE, there is no doubt in my mind that she would choose RSE over me any day. I have always considered my mother to be a very intelligent person, like you say about your girlfriend. I have never stopped wondering how such an intelligent person could fall for such a load of crap so completely. I have not found an answer to that question. Maybe, it just means that emotions (such as fear of death) are stronger than reason and logic.
For my own mental health it has been and still is very important to keep hoping that my mother will come to her senses one day and wake up from the RSE-hallucination. So that is what I do and I think it is preferable to thinking that is all is lost.