I almost left when I was 19, but couldn't disappoint my parents. Decided to stay and do it their way. I hung on for 2 more decades. Then FINALLY decided to live my own life.
What im saying is, move on. Your paths may cross again some time in the distant future, and circumstances might be open for you being together. Who knows. But for now, emotionally move on from this girl. She sounds really messed up, more messed up than she was in the first years you knew her. I'm sorry your life too was affected by this cult. She needs to get out of it, but that is only going to happen when she's ready, and she's not moving in that direction right now. let her go.