How will you feel if she doesn't ask? Do you think that you might then conclude that she doesn't really want you to email? Why not try experimenting by emailing and seeing how that works for you, if you think it might help you make progress?

I always think that my therapist just wants me to make progress. We're a team, and our joint goal is for me to strengthen myself to deal with everything better. I email him, because it helps me. He is happy to read it, because he is wishing me well and trying to understand better how to help me.