My T would often go on vacation for 3-8+ weeks at a time and I'd write her snail mail letters to her office sometimes. I didn't care that she wouldn't see them for that long, I could picture her eventually (when she got back) opening and reading them and that was enough for me. We never even really discussed what I'd written (just "that" I'd written a lot or whatever). If you feel like emailing, I would just email that you feel like emailing and that you're wondering/thinking about that, etc., just as you have posted here? She'll probably read it eventually, before you see her again.