Hi McKell,
I was just talking about this today! Sometimes we process information after the fact. It's perfectly normal. Often I call T and just leave a message that he doesn't have to return and I let him know that.
Once I was totally po'd at him and I wrote a four page handwritten letter and mailed it! I was so embarrassed because by the time my session rolled around I had calmed down quite a bit. But he did bring up the letter and asked if he could respond. We talked about it and it was okay, even though I felt like a bit of a jerk by then! He made me feel okay about it.
Don't worry, I'm sure T will be receptive especially if she said it was okay to write. Why not just allow yourself that you needed to jot down those notes and send them? Don't beat yourself up, you just need to communicate with T and keep the connection alive.