I wrote my T several times a week for many years and I was in my 40's and 50's! Don't worry about whether you are doing too much just try to get it all out there so you can "see" and work with the material, however you can. If your T says something is okay with her, then try not to worry about that and just go with it. It took me 4-5 years in therapy before I could cut out the writing to her and just talk to her in my sessions each week.

Do you have a journal/write to yourself? That helped me a whole lot too.