Personally I find it interesting that your therapist didn't take the driver's seat at first, but sat behind the driver's seat. Makes me think of an article I once read which compared the therapy process to driving a car. I wonder in that case how would you feel about your therapist "driving" in your therapy, how much she does so if at all, and how much you trust her personal balanced state to do so.

These are just my first reactions to your dream. Feel free to take them or leave them. I may be very wrong. The thing that most fascinates me about dreams is that there are so many layers to them.