As someone who is in a long-term relationship with a partner who struggled with these kind of issues when we met…
She has to be willing to understand this is a problem, and even if her fears are justified, she needs help, because berating you and being manipulative by asking super loaded questions (especially in the middle of the night, wtf. she needs some work on boundaries, too) is in no way shape or form a normal or healthy aspect of any functioning relationship.
Be ready to accept that sometimes things like manipulative behavior come from things like fears of abandonment. It doesn’t make them okay, but it should give us pause and consider that people aren’t doing it because they want to hurt us. It took me a while to understand my partner was doing things that pushed me away because she was scared of losing me, because it’s totally backwards in my mind. It just means you have to consider the possibility that this isn’t because she’s selfish, but actually potentially dealing with other kinds of mental health issues. She still needs to work on it, and she still needs help for it, but please have a little compassion.
Be willing to go to counseling with her if you want to try to make it work, but she has to be able to see what she has done, show sincere regret, and want to change. It can take time, and everyone deserves that chance, but only if they’re willing to put in the work.
If she’s unable or unwilling to accept how hurtful and manipulative what she did was, and that she at the very least needs counseling, then you need to consider ending it.
EDIT: I should be clear that “putting in the work” means up to and including: getting a mental health diagnosis, getting medication, getting a psychiatrist, getting a counselor whose field is focused on helping people with specifically this diagnosis, and then working through their problems.