When a therapist feels they can no longer help a client the ethical thing to do is be honest and refer the client on, not to sit there facepalming like some kind of moronic sitcom character. She is wasting your time and money and not behaving ethically.
My T says human beings are intrinsically interesting, so if you are bored by what they are saying, you must look at what they're not saying. (but is apparent through other cues). She's not doing her job if she is being inattentive.
I definitely think you should cut your losses, but like Skyscraper says, I'd be very tempted to call her on it, at least via email!
Do what's best for you though.