BTW, I can't imagine any therapist would intentionally create distress by using a trumped up situation like a cancelation in order to help a client grow. There's usually more than enough material to work with and the normal day to day activities that arise.
This is why it's so important for a therapist to know their own stuff. If your therapist can't recognize their own countertransference, how can you trust that she won't throw back on you that it's your projection, when in fact, it's coming from her...hopefully that made sense.
I hope you're feeling better soon,
Shrinklady