Call her. If anything, you can let her know how you are feeling and what you are going through right NOW. Or if the feeling has passed, call and let her know what you WENT through, just so she is aware. I have found sometimes it is just helpful for me to know my T is aware of what I'm dealing with, even though I don't talk to T on the phone about it. (My T only calls me back if I specificially ask for a call back, but I can always leave messages and just check in on voicemail if I need to.)

Call. Better to call and say "I'm in a sucky place and want you to know. I need to schedule an appointment with you." then say and do nothing and feel even worse later.