Not always and my contract states I don't guarantee an outcome. But this discussion is not whether the therapy the OP is engaging in is useful to her - it is whether the billing for this time was proper. I can't bill one client for time spent working on another file or if I did not do the work - which is what this therapist failed to do in this instance -her job - the thing therapists claim they paid for doing.
Perhaps therapists need a K with clients that says they get paid for just renting out the space (which is how I have always seen it) - in my opinion, and this is not that of OP based on her responses to me - they don't do anything to begin with. But they claim they do - so I expect them to do that which they claim they do - appear to pay attention.

I am fascinated at how many rush in to defend therapists and give them leeway not given to others on a regular basis. I suppose it is no wonder they have god complexes