If she is old enough and already knows those things, then it is time to get on and start trotting circles. Are you riding her in a western or english saddle? Have you desensatized her to the movement of the stirrup leathers for when you climb on? If you haven't, that is something you should probably do right before you get on.
Have you done any ground driving?
How does she do with lateral & vertical flexion (this should be started from the ground)?
Have you exposed her to things outside of your normal work area (ponying from another horse down the road or out on the trail)?
Does she walk/trot/canter quietly & easily while lounging?