I sympathize with you. I, too, sometimes have lessons where I'm just not sure if it's my fault it was a boring lesson or the instructor. Sometimes I also wonder if she was supposed to say more, or say it differently. I guess because I'm not so self-confident in riding. Maybe your instructor just had a bad day? Or is she like that all the time?
Mine is sometimes quiet and annoys me by saying, Okay, so what do you want to learn? But most of the time she has an active lesson plan and challenges me. So I forgive her for her lapses. Lessons are so expensive, and I'm starting to realize fantastic, awesome instructors are not easy to find!