I doubt she has Munchausen's, that's a much more serious, habitual illness (she'd be doing it to "everyone"/everytime, even at work would probably have had real multiple surgeries for not real illnesses, not able to hold down a job, etc.), sounds like she was just inventing things to hurt you or get you to leave her alone, it sounds like to me. I would give up on the relationship and her. It doesn't sound like there's anything there to "save". It is good she was there for you when your father was sick and it's good that she doesn't seem to have a "real" problem but since she has said to you, "leave me alone" I would do just that.

If she contacts you, you could tell her you called her office to find out how she was and learned she was fine and at a conference. You don't have to be "accusing" or anything, just stay with "facts" and don't get "taken" again by her.