Thank you for your responses - I didn't even expect people to read the whole thing so I really appreciate that you took the time to respond.
I might try the journaling thing. She says how she likes my emails because I express myself well in writing. So maybe journaling will help too.

I'm not sure if I'm going to be able to bring this up at the next session with her. Because I'm getting really anxious now about why she couldn't come in today. I just assumed she was sick, but there are reasons in her personal life for why she has to go in a few weeks and I'm really worried now that it's all sped up quicker and something to do with all that has come up in the past couple of days. So now I'm a bit worried about her.

Except I don't want to tell her that. Because when I first found out what was happening, I worried that if I talked about the things that are really hard for me, it might be too much for her, kind of like dumping all my mess on her when she has her own struggles. And she replied that she didn't want me worrying about her while she was worrying about me. And I feel like by worrying about her, I'm not respecting the fact that she doesn't want me to worry about her.

I really just want to ask her, to know what's going on, why she couldn't come in today, so that I don't keep worrying about what might have happened. But I won't see her for another week and I don't want to email her to ask in case she's already got a lot on her plate right now.

But thank you for replying to my earlier ramblings, I really appreciate it!