What do you do when your therapist tries to hold you in therapy against your will?

At the beginning of my therapy hour today I told my therapist I wanted to see her just once a week. I have been seeing her twice a week till now. She said nothing.

At the end of the hour, I said, “I will be seeing you once a week. I won’t be here Thursday.” She said, “Well, I’ll be here. I’ll be waiting for you whether you are here or not. That hour is reserved for you.” I said, “But I want to see you once a week.” She said, “Whether you are here or not I will be here waiting.” I said, “I’m afraid that if I don’t show up you will bill me.” She said, “You’re trying to make it about the money.” Not wanting to get billed for the hour, I said I would be there on Thursday. She is forcing me to see her. It’s as if she’s holding me as a prisoner. Is this professional behavior? Is this ethical behavior for a professional person.

I came a cross a web site that lists red flags to look out for with therapists. One of them is “Counselor tries to keep you in therapy against your will.” That’s exactly what she’s doing. Tell me that’s ethical or professional behavior.