My child's therapist (he was around 12 at the time), a very seasoned therapist with about 35 years of experience, took a lot of notes, at least when I was in a joint session. I'd never had a therapist take notes directly like that, but I felt he was very much engaged as he did so. It was often useful because it seemed like the therapist used the notes to highlight important issues in future sessions.

So I think I experienced how note taking can be effective, but if that is not your experience and she works in a way that doesn't work for you, then perhaps a change in therapists is warranted.