Let me explain this another way ECF. You can ring and write letters till the cows come home, and if she has uncontrolled PTSD, or is in denial about PTSD, then you will not likely get any responses from her.

The only way you are going to know for sure, is get in the car and visit her unexpectedly once. Talk with her face to face, and if she doesn't listen to you face to face, and be pushy, trust me on that, then you need to backoff at that point, and wait for her to make contact if she desires.

If you get rejected when face to face, I have no doubt it is going to hurt, but because you are only girlfriend boyfriend, and not married as such, you would need to backoff at that point and most likely move on with your life. If she wakes up and realise that she lost the person she loves, and you are not within another relationship, then maybe give it a go from that point.

Trust me though, if you are saying she most likely has PTSD and doesn't know about it, then you need to speak with her face to face, not by phone or letter.