What if you printed this and brought it to session? You'd have that sense of the feelings you have right in this moment being preserved, so she'd still get that experience of reading exactly how you're feeling, but it would allow you to sit with it for now, watch how it shifts over time, and still know you'd be able to talk about it faster than if you tried to just talk anything out without this printout. Like: "T: I want to discuss this for 15 minutes and then switch to SE." or something?

I know it's a struggle to deal with the "there's not enough time" feeling. I think you know I'm not against email in general, but it sounds like you'd consider it more beneficial 48 hours from now, when these issues aren't pressing you, to know that you did not email her, rather than giving into an internal pressure if you don't think it will be helpful in the big picture.

Also, this might be an excellent time to engage in some DBT pleasurable distractions or reaching out to help others, or maybe writing a long emotional letter about how the divorce feels, even more than you have, to help you vent it and let go of it for now.