Do it. That's your session and your time. I do not see why a therapist would have any problems reading your journal during session. I think that good therapists would actually appreciate that and applaud you for it. A good therapist should also be flexible and understanding to know that it can be challenging to verbalize our thoughts and feelings. I'd be worried and uncomfortable if I've a therapist who doesn't appreciate written material or is unwilling to read them during our meeting time.

Why doesn't she offer email? Would it be possible for you to send her your thoughts some time before the session?