I've been in therapy for 5 years now. In the first three years, I'd have an extra session every 1-2 weeks, until we went over to two sessions for a while. By now, I can mostly reach out via phone, but I still do that most weeks. It's completely fine to reach out to your T as much as you need to, though it's a good idea for the two of you to discuss the exact policy on this. You're still developing your different coping skills and wanting to rely on someone is very common, but different Ts have different boundaries on what is okay to do (for example I can't just call my T every day he works, we have set days).

What I'd probably do in your shoes is contact her and ask whether it'd be okay to write something, if you don't feel like going for an appointment and otherwise I'd go for an appointment and discuss other ways of contact there as well as the current struggles.