I understand, but also think (as I'm sure you do too) that you are over reacting here. It's okay, this reaction has meaning, but you do not have act on it at all - such as quitting therapy. You can explore it and look at reasonably.

There are a host of explanations that may account for her lack of response so far.

If you don't hear from her can't you just call her office line and get it squared away? Insurance companies are such a pain.

This will pass, all will be resolved in due course. You'll see.