I don't have time for a more detailed reply right now, since I'm heading out to my own T appointment. I just wanted to say that recently, I felt very distant from my T and I sent her an email very similar to your letter. She didn't see if before session, so she read it during my session. My T told me that she was so glad I'd sent her the email, apologized for not reading it prior to the appointment, and then we talked some about the distance I was feeling. My T owned her part in the distance and agreed that she'd been a bit "off" the last few session. It was very good for me to tell T exactly what I was feeling without trying to couch it in "friendly" terms.

So, I think what you SHOULD do is whatever feels right to you, even if that means sending her a rather blunt email or being very straightforward about how you're feeling in session.