I see it the same as stopdog, that your therapist was saying your statement about not knowing if you should keep coming was a way of threatening to leave, not that you were threatening her personally.

The issue with the craft friend really sent you into a tailspin and you took big risks to ensure your relationship with this therapist would continue in a safe way. Could something about that have made you turn all of this on yourself as punishment? Because that's what it looks like from here.

Do you think that maybe she was pointing out a self destructive pattern?

She has always seemed to be a good, stable therapist for you. Unless she flat out told you that you were wasting her time, one way to look at all of this is that the shame you felt over the craft friend situation is destroying you from the inside. Shame is insidious. Could that be what your therapist wanted you to get at the root of?