You have the answer, run!
No, seriously we cant tell you what to do or have all the facts, but you really have yourself in a corner, chances are she still believes it is the Truth (internal speak, they call it The Truth) and WILL return to it with gusto when she has a child to think about.
The cult is all about FOG (fear obligation guilt) the classic toolbox of all cults. She will have her buttons pushed accordingly. Unless she can educate herself about cult mind control and see it for herself then her life will always be controlled to some extent by it.
https://freedomofmind.com//Info/BITE/bitemodel.php
Good luck