Maybe you can negotiate with her. Tell her that for the time being, you'd really prefer to intersperse more "light" sessions with "serious" sessions. And that you'd like to have more time to do any homework assignments.

If your sessions were spaced out farther a part, I would say that it's fine to want a break now and again. But since your session frequency is pretty high and you don't want to give up that time, I would REALLY try to squeeze in some productivity in there. It's a trade-off, in other words. I think going in there expecting to do some work keeps things professional and justifies (in both of your minds) the intensity of your relationship.

Just a thought.