That's really stressful. Maybe journaling out a theoretical "session" with her when you're having a hard time. What you're feeling and what you imagine she might say or suggest in that situation? I kind of mentally bounce things off in my head as though I were talking to my psychiatrist.
I too have therapy only once per month, although that is more my choice so a bit different than in your case. I have therapy with my psychiatrist, so she has a higher patient panel than a typical therapist. we had discussed me going to see an actual therapist weekly or every other week for awhile, but I have a good connection with her now, that I don't really want to alter that paradigm right now (not to mention the expense!) But I've been lucky that I've never had a cancellation.
Maybe if things get really rough see if your primary care doc can fit you in for an appointment? It's not therapy, but as a family practice physician assistant I assure you that we are no strangers to anxiety, depression, life stress, we see patients with it all the time.I don't know if that would help you, but again, it's an option to consider.