Therapy is a conversation; you get to say what you want and T gets to say what she wants. Just keep it short and to the point as you have been, "not interested" and let her go on about it if she wants; you can't control another person and what they say/want to talk about. How would you like if T said you had to consider it and talk about it? You wouldn't. Polite is listening to other people, not trying to manipulate them to only talk about what is interesting to you; you are in therapy because, presumably, that isn't working very well? (your way).