Right now she's in the entitlement phase. She feels entitled to what she did because of your past sins. Well I bet she wasn't exactly a saint either, but needs someone to blame for "forcing" her to have an A.
It's a fine line to dance right now. You have to somehow shift the dynamic where it's not you who has to prove to be trustworthy, but her. She has to see you as the person to be pursued. That's why when you confronted the OM and said you were done, she thought "whoah, I'm going to be left alone with no one." She has to want you. Don't make yourself too available. It's that pursuer/pursuee dynamic. She's starting to show some interest, now you have to slowly reel her in.
If you go after her wholeheartedly, then she knows that she's got you and not the other way around.
