In that letter i hope you list all the issues. When you come to the session - look at the list and tell her, one by one. This makes things easier for people who are insecure and tend to hide things - if everything is arranged already - it easier to start off. The quality of your therapy depends on you as well as on your therapist...now you see it. After you tell all the issues ask her when NOW doesn she thing is the right time for termination( or whatever it is called)

I hope you work it out together.