I think that one of the skills that is often helpful in therapy is to learn to say when it's not working for you. A straightforward statement at the beginning of therapy, as in "I'd like to talk today about X" may be all that's needed to correct the direction. You don't need to make a big deal out of how she's focusing on this an you want to focus on that, or be confrontational.

I think that this issue will raise itself with another therapist, because no one can be so attuned or mind-reading or otherwise perfectly matched with you so that sessions will always go exactly as you want. I have many times had to tell my therapists that I needed something different and they (3 in long term therapy) were able to accommodate me, not always right away and not always perfectly.

But this seems how it is to me in interpersonal relationships in general, that I need to ask for what I want and cope maturely when i don't get it; that communication improvements in therapy helped me in outside relationships.