I think that when your T discovered that you were at the same artworkshop, she should have excused herself and gone home (even though she had paid to be there). I think the therapeutic relationship is usually best kept in the therapists room, and that she should have recognized that her being there would cause you discomfort, or worse emotions. That would be hard luck for her, but something you have to accept if you are a T. I too would feel unhappy that she had never spoken up about her own interest in art. I feel somehow disrespected when a T takes the blank slate approach. I saw a T for a while who was blank slate and I had to stop going in the end. I think T's in the U.K. are often trained to be blank slate, but it wasn't helpful for me. To me it feels like they are on a power trip if they withhold their 'self' like that.