Yep, I feel she’s quite literally holding me to ransom. She’s been through some very dysfunctional relationships before, I get that. This isn’t the way though. Thanks for the confirmation chaps.
If she's that damaged that she wants to bring that sort of power dynamic into the relationship to control you because she fears for herself then she's broken and may be using you for security and comfort, rather than because she loves you the same way that you love her. It's one thing for you to be willing to try and fix her, but you shouldn't reward that kind of behaviour by giving into her demands. You have to show her that this behaviour/demand/expectation is not acceptable in the relationship as you go forwards.
If you give in, you'll always be giving in. If she breaks up with you, then she's not ready for a serious adult relationship where you live and work together to support each other and build a life for you both.